SAT Subject Physics Practice Question 37: Answer and Explanation

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Question: 37

3. A box with a mass of 2 kg accelerates in a straight line from 4 m/s to 8 m/s due to the application of a force whose duration is 0.5 s. Find the average strength of this force.

A. 2 N
B. 4 N
C. 8 N
D. 12 N
E. 16 N

Correct Answer: E


The impulse delivered to the ball, J = t, equals its change in momentum. Thus,

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