SAT Subject Physics Practice Question 516: Answer and Explanation
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
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.