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4) Two identical toy cars are placed on a horizontal table. The first car is hit from behind by a lump of clay that sticks to the back of the car causing it to move forward with a velocity $v_1$. The second car is hit from behind by a ball that bounces directly back off the car causing the car to move forward with a velocity $v_2$. See the figure above. Assuming that the clay and ball have the same initial velocity and the same mass, which statement best describes the final velocities of the cars $v_1$ and $v_2$? A. $v_1 > v_2$ because the clay imparts all of its momentum to the car. B. $v_1 > v_2$ because the ball impart only part of its momentum to the car. C. $v_1 < v_2$ because the ball imparts more momentum to the car. D. $v_1 < v_2$ because the ball and car have a perfectly elastic collision.

          4) Two identical toy cars are placed on a horizontal table. The first car is hit from behind by a lump of clay that sticks to the back of the car causing it to move forward with a velocity $v_1$. The second car is hit from behind by a ball that bounces directly back off the car causing the car to move forward with a velocity $v_2$. See the figure above. Assuming that the clay and ball have the same initial velocity and the same mass, which statement best describes the final velocities of the cars $v_1$ and $v_2$?
A. $v_1 > v_2$ because the clay imparts all of its momentum to the car.
B. $v_1 > v_2$ because the ball impart only part of its momentum to the car.
C. $v_1 < v_2$ because the ball imparts more momentum to the car.
D. $v_1 < v_2$ because the ball and car have a perfectly elastic collision.

4) Two identical toy cars are placed on a horizontal table. The first car is hit from behind by a lump of clay that sticks to the back of the car causing it to move forward with a velocity v1. The second car is hit from behind by a ball that bounces directly back off the car causing the car to move forward with a velocity v2. See the figure above. Assuming that the clay and ball have the same initial velocity and the same mass, which statement best describes the final velocities of the cars v1 and v2?
A. v1 > v2 because the clay imparts all of its momentum to the car.
B. v1 > v2 because the ball impart only part of its momentum to the car.
C. v1 < v2 because the ball imparts more momentum to the car.
D. v1 < v2 because the ball and car have a perfectly elastic collision.

Added by Natalia C.

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