本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学
[单选题]
A ball with mass $m$ is released from a height of $h$ and undergoes free fall. The ball hits the ground and rebounds vertically. On rebound, the ball reaches a maximum height of $h'$. The time taken for the collision is $T$. What are the magnitude of the average net force on the ball and change in kinetic energy of the ball?
A. Change in kinetic energy is mg(h−h′); Average force is $\frac{\sqrt{2gh}+\sqrt{2gh'}}{T}$
B. Change in kinetic energy is mg(h′−h); Average force is $\frac{\sqrt{2gh}-\sqrt{2gh'}}{T}$
C. Change in kinetic energy is mg(h′−h); Average force is $\frac{\sqrt{2gh}+\sqrt{2gh'}}{T}$
D. Change in kinetic energy is mg(h−h′); Average force is $\frac{\sqrt{2gh}-\sqrt{2gh'}}{T}$
参考答案: A
本题详细解析:
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