SAT Subject Physics Practice Question 624: Answer and Explanation

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Question: 624

5. Two spheres are placed into free fall from rest. Sphere B has a mass three times larger than sphere A. Which statement(s) correctly explains the situation?

I. Sphere B falls faster.

II. Sphere B has more momentum when the two reach the ground.

III. Both spheres reach the ground with the same kinetic energy.

A. I only
B. II only
C. I and III only
D. II and II only
E. I, II, and III

Correct Answer: B


The correct answer is (B). Both spheres fall from the same height. This means the objects are in free fall, so their accelerations are the same. Sphere B has more mass than sphere A, which gives sphere B more momentum and more kinetic energy when the two spheres reach the ground.

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