SAT Subject Physics Practice Question 55: Answer and Explanation

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Question: 55

2. A block attached to an ideal spring undergoes simple harmonic motion. The acceleration of the block has its maximum magnitude at the point where

A. the speed is the maximum
B. the potential energy is the minimum
C. the speed is the minimum
D. the restoring force is the minimum
E. the kinetic energy is the maximum

Correct Answer: C

Explanation:

The acceleration of the block has its maximum magnitude at the points where its displacement from equilibrium has the maximum magnitude (since a = ). At the endpoints of the oscillation region, the potential energy is maximized and the kinetic energy (and hence the speed) is zero.

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