**AP Physics 1 Question 246: Answer and Explanation**

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**Question: 246**

**1.** 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 speed is the minimum
- C. the restoring force is the minimum
- D. the kinetic energy is the maximum

**Correct Answer:** B

**Explanation:**

**B**

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