[单选题]
The graph shows the variation with time $t$ of the displacement $s$ of an object suspended by a spring. At what time is the acceleration in the negative direction at a maximum?
A. 4.0 s
B. 3.0 s
C. 2.0 s
D. 1.0 s
参考答案: D
本题详细解析:
Explanation:
Recall for simple harmonic motion, $a∝−x$, therefore the object experiences maximum negative acceleration at maximum positive displacement from equilibrium.
