SAT Subject Physics Practice Question 516: Answer and Explanation

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Question: 516

2. A 2.5 kg ball is dropped onto a concrete floor. It strikes the floor with a momentum of 20 kg·m/s and bounces away from the floor with a momentum of 16 kg·m/s.

What is the change of momentum of the ball?

A. 4 kg·m/s
B. 8 kg·m/s
C. 32 kg·m/s
D. 36 kg·m/s
E. 40 kg·m/s

Correct Answer: A

Explanation:

The correct answer is (A). Subtract the momentum of the ball from its original momentum to find the momentum of the ball as it bounces away from the floor.

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