The car will have traveled through an angle of approximately 9.29 degrees when the magnitude of its total acceleration is 2.2 m/s^2.
To solve this problem, we need to determine the magnitude of the radial acceleration experienced by the car as it moves along the curve. The radial acceleration can be found using the equation:
ar = v^2/r
where v is the tangential velocity of the car and r is the radius of the curve.
Since the car starts from rest, its initial tangential velocity is zero, and its radial acceleration is equal to its total acceleration. Therefore, we can write:
ar = a
a = v^2/r
We can rearrange this equation to solve for the tangential velocity of the car:
v = √(ar * r)
Substituting the given values, we have:
v = √(2.2 m/s^2 * 100 m) = 14.5 m/s
Next, we can use the tangential velocity to determine the angle through which the car has traveled. The tangential distance traveled by the car can be found using the equation:
d = v * t
where t is the time elapsed.
Since the tangential acceleration is given as 1.3 m/s^2, we can use this to determine the time elapsed:
a = v / t
t = v / a
Substituting the values, we have:
t = 14.5 m/s / 1.3 m/s^2 = 11.15 s
Finally, we can use the time elapsed and the radius of the curve to find the angle through which the car has traveled:
θ = d / r = v * t / r = (14.5 m/s) * (11.15 s) / (100 m) = 0.162 radians = 9.29 degrees
So, the car will have traveled through an angle of approximately 9.29 degrees when the magnitude of its total acceleration is 2.2 m/s^2.
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In the figure the battery has a potential difference of V = 10.0 V and the five capacitors each have a capacitance of 8.60 µF. What is the charge on (a) capacitor 1 and (b) capacitor 2?
A battery is used to charge a parallel plate capacitive with capacitance C to a voltage differential V. Similar charge is applied to a voltage differential by a second capacitor with a capacitance of 2 C. 2
What distinguishes current and voltage from one another?
A power transfer is possible in an electric circuit. Voltage measures the amount of energy transmitted per unit of charge, while current measures the rate of charge flow. We can add the following definitions to the power equation: Voltage times current are the formula for electrical power. according to watts
What does the term "voltage" mean?
The "pressure" that pushes electricity is referred to as voltage. A voltage is measured in volts (V), and greater voltages result in more electricity flowing to an electronic equipment. However, electronic gadgets must work within a range of voltages since too much voltage might harm their circuitry.
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A car starts from rest on a curve with a radius of 150 m and tangential acceleration of 1.3 m/s2 .Through what angle will the car have traveled when the magnitude of its total acceleration is 3.0 m/s2 ?
We can start by using the formula for tangential acceleration:
a_t = r * α
How to use tangential acceleration ?where a_t is the tangential acceleration, r is the radius of the curve, and α is the angular acceleration. Rearranging this equation, we get:α = a_t / r = 1.3 m/s^2 / 150 m = 0.00867 rad/s^2
Next, we can use the formula for the magnitude of total acceleration:a_total = √(a_t^2 + a_c^2)
where a_c is the centripetal acceleration. We can rearrange this equation to solve for a_c:
a_c = √(a_total^2 - a_t^2) = √(3.0^2 - 1.3^2) = 2.5 m/s^2
Now, we can use the formula for centripetal acceleration:a_c = r * ω^2
where ω is the angular velocity. Rearranging this equation, we get:
ω = √(a_c / r) = √(2.5 m/s^2 / 150 m) = 0.1155 rad/s
Finally, we can use the formula for angular displacement:
θ= ω^2 * t / 2
where t is the time elapsed. Since the car starts from rest, we can use the formula for initial velocity and acceleration:v_i = 0
a = a_t
to find the time it takes for the car to reach the required total acceleration of 3.0 m/s^2:
a = (v_f - v_i) / t
t = (v_f - v_i) / a
t = v_f / a
where v_f is the final velocity. Using the formula for final velocity and the fact that the car starts from rest, we get:
v_f^2 = 2 * a_t * θ
v_f = √(2 * a_t * θ)
t = √(2 * θ / a_t)
Substituting the values we have calculated, we get:t = √(2 * θ / 1.3) = √(1.5385 * θ)
t = v_f / a = √(2 * a_t * θ) / a_t = √(2 * θ / 1.3)
Setting these two expressions for t equal to each other, we get:
√(1.5385 * θ) = √(2 * θ / 1.3)
Squaring both sides and solving for θ, we get:
θ = 4.89 radians
Therefore, the car will have traveled through an angle of 4.89 radians when the magnitude of its total acceleration is 3.0 m/s^2.
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A bus can travel 63 miles in 1. 4 hours. If its speed is increased by 10 mph, how far can the bus travel in 4 hours?.
The distance traveled by bus after its speed increased by 10 mph is 220 miles.
Given that, the bus can travel 63 miles in 1.4 hours.
The speed of the bus is:
speed = 63/1.4 mph
speed = 45 mph
Now, the speed of the bus is increased by 10 mph, therefore, the new speed is:
45 + 10= 55 mph
The distance traveled in 4 hours with a speed of 55mph is:
d = 4 ×55 miles
d = 220 miles
Hence, the distance traveled by bus after its speed increased by 10 mph is 220 miles.
What is speed?
Speed is the amount of distance travelled in a given amount of time.To know more about speed, click the link given below:
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Calculate acceleration: mr. Barrentine's dog, razorback was at rest and ran 40 meters to catch a rabbit. Razorback ran the 40m in 8 seconds. What is his acceleration?.
This makes sense as he was able to reach the rabbit in 8 seconds.
What is accelaration?Acceleration is the rate if we can object increase is speed velocity of rate of change it is the rate of change of velocity of a time at the rate of change of the position of an object acceleration can be either positive when the speed of an object increasing a negative in the speed of the object is decreasing.
Acceleration is the rate of change in velocity over time and can be calculated using the equation a=v/t, where a is acceleration, v is the change in velocity (in this case, 40 m/s) and t is the time taken (8 seconds). Therefore, razorback's acceleration is 5 m/s^2. This means razorback's velocity was increasing by 5 m/s every second.
To put this into perspective, it means razorback was running at 10 m/s after 4 seconds and at 15 m/s after 6 seconds. This makes sense as he was able to reach the rabbit in 8 seconds.
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what is the smallest planet of the inner planets and look very much like earth's moon?
The smallest planet among the inner planets is Mercury. It is the closest planet to the sun and has a diameter of approximately 4,880 km, which is just over one-third the size of Earth.
What is more about Mercury ?Mercury is also the second densest planet in the solar system, after Earth.
Mercury's surface is heavily cratered, similar to the surface of the Earth's moon. This is because both Mercury and the moon lack an atmosphere and do not have active geological processes that could smooth out their surfaces. The temperature on Mercury's surface can reach over 400 degrees Celsius during the day and drop to -170 degrees Celsius at night, due to its proximity to the sun and lack of atmosphereMercury also has a very eccentric orbit, meaning that its distance from the sun varies widely over the course of its year. Its orbital period is just 88 Earth days, which means it experiences just one and a half days for every year. Due to its small size and proximity to the sun, Mercury is difficult to observe from Earth and has only been visited by two space probes, Mariner 10 and Messenger.To know more about Mercury , check out :
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What is the smallest unit of an element that retains the elements properties?
"An atom is the smallest unit of matter retaining the properties of elements."
An atom is a unit of matter that defines a chemical element inextricably.
Atoms are made up of a core nucleus that is surrounded by one or more negatively charged electrons. The positively charged nucleus itself houses one or more protons and neutrons, which are large, heavy particles.
The atoms in a molecule retain their original properties when we break them down into their component parts.
The atoms neon and hydrogen are notable examples of. Atoms have a neutral electric charge, which is zero.
They are indestructible particles that cannot be generated or destroyed by chemical processes.
Therefore, the smallest unit of matter that can retain properties of elements is called an atom.
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Yellow lines in the absorption spectrum of mercury vapor correspond to photons with an energy of about 2 eV. What can you conclude about the electron energy levels in mercury atoms?
A.
There must be energy levels with a difference of about 4 eV.
B.
There must be energy levels with a difference of about 2 eV.
C.
There must be energy levels with a difference of about 1 eV.
D.
There must be energy levels with no difference in energies.
Yellow lines in the absorption spectrum of mercury vapor correspond to photons with an energy of about 2 eV, it is concluded that the electron energy levels in mercury atoms are such that there must be energy levels with a difference of about 2 eV, which is in option B.
What is the absorption spectrum?Yellow lines in the absorption spectrum of mercury vapor correspond to photons with an energy of about 2 eV, which indicates that the electrons in the mercury atoms are absorbing photons with an energy equal to the energy difference between two energy levels in the atoms.
Hence, it is concluded that the electron energy levels in mercury atoms are such that there must be energy levels with a difference of about 2 eV, which is in option B.
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What is the power in a circuit that has a current of 12 A and a resistance of 100 Ω? (Note: 1 A2·Ω = 1 W)
The power through a circuit is the product of the current and voltage through the circuit. The power in the circuit with 12 A current and 100 ohm resistance is 14400 W or 14.4 kW.
What is power ?Power in a circuit is the product of the voltage across the circuit and the current through it. Power is a scalar quantity and it can defined as the rate of work done.
P = IV,
according to Ohm's law, V = IR
Where I is current R is the resistance.
Then, P = I²R.
Given, I = 12 A
R = 100 Ω
then, P =( 12 A )² × 100 Ω = 14400 W = 14.4 kW.
Therefore, the power in the circuit is 14.4 kW.
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Straight line distance between the initial position and final position of any body is known as
The displacement of any body is the difference along a straight line between its original location and its end position.
Simply said, displacement is the smallest distance any item has travelled.Drawing a straight line from the object's original location to its end position will reveal it.The displacement is stated to be zero if an object's beginning and end positions are identical even after travelling x km. It is a vector quantity which has magnitude as well as direction.It is usually represented by a vector arrow pointing from the initial position to the final position of the body. This distance can be measured using a ruler or other measuring device.
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A mass of 0. 30 kg is attached to a spring and is set into vibration with a period of 0. 24 s. What is the spring constant of the spring?.
The spring constant of the spring is 32.66 N/m.
What is a spring constant?
Spring Constant (K)
The force required for each unit of spring extension is now the definition of the spring constant. Calculating the amount of force necessary to bend the spring is simple when you know the spring constant.
Using Hooke's rule,
F = -KX
K = -F/ X ⇢ (1)
Equation (1) gives the spring constant, which is given in units of N/m (Newton per meter).
How to calculate the wavelength?
The spring constant (k) can be calculated using the formula:
k = (4π^2 * m) / T^2
where m is the mass of the object (0.30 kg) and T is the period of vibration (0.24 s).
Plugging in the values, we get:
k = (4 * π^2 * 0.30) / (0.24^2)
k = 32.66 N/m
So, the spring constant of the spring is 32.66 N/m.
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.
Three objects having the same mass begin at the same height, and all move down the same vertical distance H. One falls straight down, one slides down a frictionless inclined plane and one swings on the end of a string.
(a) In which case does the object have the biggest total work done on it by all forces during its motion?
i) Free Fall
ii) Incline
iii) String
iv) Same
Two things have comparable densities if they have the same mass. The acceleration is determined by multiplying the gravity velocity by the sine of the angle for a flat incline of angle degrees.
Is motion without friction possible?It is possible to move without friction! An object will appear to be moving even though it is fixed inside one reference frame in which it is moving relative to the other. Friction is therefore not at all necessary for motion.
Can momentum and kinetic be the same for two objects of differing masses?If a heavy particle and a light particle are traveling at the same speed, the heavy particle has lot of kinetic energy. As a result, the two bodies' kinetic energy and momentums will be equal.
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what is the resolving power of a 2-meter-diameter telescope focusing visible light?
A telescope's resolving power may be determined using the following formula: Resolving power is calculated as 11.25 seconds of arc/d, where d is the centimeter-based diameter of the objective.
What should a telescope's resolving power be?For small telescopes, the resolving power is often calculated using the Dawes limit: = 4.56/D, where is the resolving power in arcseconds and D is the aperture in inches. A 3-inch telescope, for instance, should have a resolving power of around 1.5", but an 8-inch telescope has a resolving power of roughly 0.57".
The pupil of your eye and the apertures of telescopes and cameras are examples of circular apertures that fall under the 1.22 factor. Diffraction sets a resolution limit on the amount of light that may travel through an aperture of diameter D.
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From the way that lunar eclipses happen, the Ancient Greeks were able to calculate the distance from the ____ to the ____.
From the way that lunar eclipses happen, the Ancient Greeks were able to calculate the distance from the earth to the moon
How did the ancient Greeks gauge the size of the Moon using eclipses?Greek astronomers discovered that the Earth's shadow was around 2.5 times the apparent size of the Moon and lasted three hours from the beginning to the end by following its path over the Moon.
Eclipses of the sun and the moon happen equally often. Because Earth's shadow on the Moon during a lunar eclipse is far greater than the shadow the Moon throws on Earth during a solar eclipse, lunar eclipses are more widely seen. As a result, a lunar eclipse is more likely to be seen than a solar eclipse.
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A student completes a PET experiment using chloroplasts from leaves lacking pigments that absorb in the 550 nm to 600 nm wavelength range. Which color of light should they avoid in their experiment if they want to measure activity at different wavelengths? O Blue O Orange O Yellow O Red O Violet
The student should avoid blue, orange, yellow, and red light in their experiment.
The student should avoid blue, orange, yellow, and red light in their experiment if they want to measure activity at different wavelengths because these colors are absorbed in the 550 nm to 600 nm wavelength range. This means that the energy from these colors is absorbed by the chloroplasts and cannot be used for photosynthesis. Violet light, on the other hand, is not absorbed in this wavelength range so it can be used by the chloroplasts for photosynthesis. Therefore, it should not be avoided.
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F = m x g is the formula of
The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Where W = weight in N. m = mass in kg and g = gravitational field strength in N/kg. g = 10 N/kg.
Ionic bonds include (more than 1 correct answer)
Ionic bonds include the transfer of electrons between atoms, the formation of ions with opposite charges, the attraction between positively and negatively charged ions, and the formation of a lattice structure in ionic compounds
Ionic bonds are a type of chemical bond that involves the transfer of electrons from one atom to another, resulting in the formation of ions with opposite charges. These ions are then attracted to each other due to their opposite charges, forming an ionic bond. Ionic compounds typically have a lattice structure, in which the ions are arranged in a repeating pattern. Example: NaCl, MgO, CaF2, Li2O, AlF3,
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the blood pressure in millimeters was measured for a large sample of people. the average pressure is 140 mm, and the sd of the measurements is 20 mm. the histogram looks reasonably like a normal curve. use the normal curve to estimate the following percentages. choose the answer that is closest to being correct.a. 10.6%
b. 89.4%
c. 39.4%
d. 78.8%
e. 68.27%
The percentage of people with blood pressure between 120 mm and 160 mm is approximately(d) 78.8%.
To estimate the percentage of people with blood pressure below 120 mm, we need to calculate the z-score for that value:
z = (120 - 140) / 20 = -1
Using a standard normal table, we can find the proportion of the distribution below a z-score of -1, which is approximately 0.1587. However, since we want the percentage below 120 mm, we need to multiply this proportion by 100 and round to one decimal place:
0.1587 x 100 ≈ 15.9%
Therefore, the percentage of people with blood pressure below 120 mm is approximately 15.9%.
To estimate the percentage of people with blood pressure between 120 mm and 160 mm, we need to calculate the z-scores for both values:
z1 = (120 - 140) / 20 = -1
z2 = (160 - 140) / 20 = 1
Using a standard normal table, we can find the proportion of the distribution between these two z-scores, which is approximately 0.7887. To find the percentage between 120 mm and 160 mm, we need to multiply this proportion by 100 and round to one decimal place:
0.7887 x 100 ≈ 78.8%
Therefore, the percentage of people with blood pressure between 120 mm and 160 mm is approximately 78.8%.
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Two solid spheres, both of radius 5cm, carry identical total charges of 2μC. Sphere A is a good conductor.Sphere B is an insulator, and its charge is distributed uniformly throughout its volume.
How do the magnitudes of the electric fields they separately create at radius 4 cm compare?
The magnitudes of the electric fields they are separately create at the radius 4 cm is the correct option is C. EA = EB > 0.
Two solid spheres, both of the radius 5cm, they carry the identical total charges of the 2μC. Sphere A is the good conductor. Sphere B is an insulator, and the charge are distributed uniformly throughout the volume. Both the spheres are produce the identical fields at the outer locations, the like particles will do at the cores, because of the spherically symmetric charge distributions.
The magnitudes of the electric fields they are separately create at the radius 4 cm is EA = EB > 0.
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What is negative in unit circle?
The negative is In the unit circle, a point is negative if it falls in the left half of the circle.
The unit circle is a circle of degree 1 with 0 near the origin of the direction plane. It is used most mathematically to describe the sine and cosine of a point on the unit circle about a point, origin, and focus, described by a positive rotation on the x-axis. Unit: Won. This is because the x-coordinate of the point is negative and the y-coordinate is positive. A point on the right half of the circle is considered positive because it has a positive x-coordinate and a positive y-coordinate.
The rotation around the x center is neither positive nor negative, and the base around the y center is positive in the top half and negative in the bottom half.
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when two vehicles collide, momentum is conserved _______.
The impact maintains momentum. Any contact between two objects that takes place in an isolated system preserves momentum.
What does momentum represent in actual life?Mass in motion is the definition of momentum. All objects have mass, thus if an object is moving, it has momentum and its mass is in motion. How much and how quickly something is moving affect how much momentum it has.
In one sentence, what is momentum?We gauge the motion of mass using momentum. Any thing in motion will have momentum. The object's momentum is determined by its mass multiplied by its velocity, according to the laws of physics. The mass and velocity of the parameters both have an impact on momentum.
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this planet is the smallest of the inner planets and looks very much like earth’s moon called?
"The planet which is smallest of the inner planets and looks very much like earth’s moon is called mercury."
Mercury is the smallest of the terrestrial planets and the innermost planet, coming the closest to our Sun.
The planets Mercury, Venus, Earth, and Mars are referred described as terrestrial due to their compact, rocky surfaces similar to Earth's terra firma. The terrestrial planets are the four that are closest to the sun.
For instance, the inner planets are substantially smaller than the outer planets in terms of size. This is because the inner planets are solid and more compact, whereas the outer planets are gaseous. As a result, the inner planets have a higher density than the outer planets.
Earth is the largest, densest, and third inner planet out of the four. It is the only planet in the solar system that currently possesses liquid water, making it the only one that can support life.
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why do we want the water to stabilize at the boiling point before removing the metal object? explain
The metal item is heated evenly and fully by allowing the water to stabilise, guaranteeing that any heating effects are realised.
Depending on the metal's thermal conductivity and specific heat capacity, when a metal item is submerged in boiling water, it warms up and may even reach a temperature greater than the boiling point of water.
The metal object's high temperature can cause the water around its surface to evaporate quickly when it is abruptly withdrawn from the boiling water. This can result in bubbles that can burst forcefully and cause splattering.
Burns or other damage may arise from this.
The metal and the water are at the same temperature and there is no longer a temperature gradient between them when the water is allowed to reach its boiling point before the metal item is removed.
As a result, there will be less severe water vaporisation, which lowers the possibility of splattering and harm.
Additionally, letting the water to stabilise guarantees that any intended effects of the heating are realised and that the metal item is heated evenly and fully.
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An NFL punter punts a 0.02 kg football
100 meters into the air.
A. What is the initial potential energy of the
ball when it's at its peak?
B. What is its final kinetic energy before it
hits the ground?
C. What is the velocity of the ball before it hits
the ground?
The initial potential energy of the ball when it's at its peak will be 20 J. The final kinetic energy before it hits the ground will be 20 J and the velocity before it hits the ground will 44.72 m/s.
How do you calculate the initial potential energy when the ball is at its peak?To calculate potential energy, we use the equation P.E. = mgh
Hence, potential energy, P.E. = mgh = 0.02 x 10 x 100 = 20 J.
How do you calculate the final kinetic energy before it hits the ground?Since the potential energy is converted to kinetic energy at this point, the final kinetic energy before it hits the ground will be 20 J.
How do you determine the velocity of the ball before it hits the ground?The velocity of the ball can be calculated by using the equation v = [tex]\sqrt{2gh}[/tex]
Hence, the velocity, v = [tex]\sqrt{2 * 10 * 100}[/tex] = 44.72 m/s.
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What are the radiation types in order from lowest to highest energy: microwaves, ultraviolet light, red light, and gamma rays?
The parts of the electromagnetic are designated as follows, from to the lowest energy: infrared photons, X-rays, ultraviolet light, visible light, infrared ( ir, and radio waves.
What's the ideal lifespan of a microwave?With normal use, the typical microwave oven lasts around seven years, and significantly less with heavy use and bad maintenance. As they become more dependent on it to reheat snacks and leftovers or to defrost meals, a large family may discover that they need to replace their appliance every four to five years.
Convection or solitary microwave: Which is better?A convection microwave includes extra characteristics in addition to being able to carry out all the tasks that a standalone microwave can. Foods can be grilled, baked, roasted, browned, and even crisped in convection microwaves.
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How do you know if a resistor is in series or parallel?
When resistance is linked in series with other resistance, as opposed to parallel, where the same nodes are connected in the same directions.
When two nodes share terminal connections, resistors are said to be in parallel. It makes no difference whether the resistors are drawn horizontally or vertically. All of the parts of a series circuit are attached end to end, creating a single route for current flow. All of the components of a parallel circuit are linked across one another to create precisely two sets of electrically coupled points.
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Four identical springs each have the same spring constant k. If these four springs are attached end to end forming a spring four times the length of one of the original springs, what will be the spring constant of the combination?.
The arrangement of the springs is in series if they are connected end to end. The forces for a sequence of springs are additive.
F1 = k1(x1) for spring 1.
F2 = k2(x2) in spring 2.
F3 = k3(x3) in spring 1.
Total Force is k1(x1)+k2(x2)+k3(x3).
Total Force is equal to (k1+k2+k3)(x,total).
The overall force acting on it is calculated by multiplying the whole length of elongation by the sum of the spring constants.
What use do springs serve?A spring is an elastic object that can store mechanical energy and release it in response to the removal of an opposing force. Springs may be the solution if you need to exert force in order to move something or keep it still without the use of an engine or other powered device.
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what temperature is ideal for disease-producing pathogens to grow?
The temperature at which disease-producing pathogens grow best depends on the specific pathogen.
However, many pathogenic bacteria grow best at temperatures between 20°C and 45°C (68°F to 113°F). This range is often referred to as the "danger zone" for food safety, as it is also the range at which foodborne pathogens can grow rapidly in perishable foods. Some pathogenic bacteria, such as those that cause food poisoning, can grow at temperatures as low as 5°C (41°F) or as high as 60°C (140°F), although their growth rates may be slower outside the optimal range. It's important to note that different pathogens have different optimal growth conditions, and other factors such as moisture and pH can also affect their growth.
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A fully charged capacitor initially has an air gap and is disconnected from the battery. A dielectric material is inserted between the plates
What happen to the free charge at surface of the capacitor plates and the total charge free and bound at the surface of the capacitor plates?
The total charge (free and bound) at the surface of the capacitor plates will be equal to the initial charge on the capacitor, minus the amount of charge that has been transferred to the dielectric material.
What is the dielectric ?A dielectric is an electrical insulator material which can be polarized by an electric field. It is a material that is used to increase the capacitance of an electrical circuit, allowing for a greater flow of electric current. Dielectrics are commonly used in capacitors, where the material separates two conducting plates, allowing a charge to build up between them. They are also used in electric motors, generators, and other electric components. Dielectrics are typically made from a variety of materials including glass, plastic, ceramic, and rubber.
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the electric potential energy of a system of two point charges is proportional to
a. The distance between the two charges.
b. The square of the distance between the two charges.
c. The inverse of the distance between the two charges.
d. The inverse of the distance between the two charges.
e. The inverse of the square of the distance between the two charges.
"The electric potential energy of a system of two point charges is proportional to the inverse of the distance between the two charges."Correct option is either C or D.
The equation for potential energy is PE = M G H, where M is mass, G is the gravitational force, and H is the height at which the item is situated. Potential energy is essentially the energy of the body due to its location or its compressed state. The joule is the SI unit for potential energy.
The work that needs to be done to transfer a unit charge from one point to another is the electric potential difference between the two points.
Mathematically, electric potential energy is given as V = k q/r.
where,
k is Coulomb's constant
q is charge
r is distance between charges
If the two charges are of the same type, either positive or negative, the electrical potential energy is positive; otherwise, it is negative. This makes sense if you think of the change in the potential energy ΔU as you bring the two charges closer or move them farther apart.
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A 5kg traveling at 4 m/s slams into a 1kg object and sticks to it. What will the final velocity of the two objects be?
Answer:
Below
Explanation:
Using conservation of momentum
mv = mv
5(4) + 1(0) = (4+1) v
( this assumes the 1 kg mass was not moving before being struck)
20 = 5 v
v = 4 m/s