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A ball is thrown downward; and its speed is v just before it strikes the ground.

ID: 1700285 • Letter: A

Question

A ball is thrown downward; and its speed is v just before it strikes the ground. After the collision with the earth, it heads upward with a speed v. Which of the following statements concerning this situation is true?

a) Only the magnitude of momentum of the earth is changed by collision (the correct answer, an explanation of why this is true would be very helpful)
b) the momentum of the earth is not changed by the collision
c) only the momentum of the ball is changed by the collision
d) the momentum of the ball is not changed by the collision
e) the collision causes both the momentum and the kinetic energy of the ball to change

Explanation / Answer

c) only the momentum of the ball is changed by the collision Change in momentum of the ball = m[v - (-v)] = m(v + v) = 2mv

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