本题目来源于试卷: Linear Momentum，类别为 IB物理学
[问答题]
A golf ball rolls off t+xu*-gty + ucehe top of a flight of concrete steps of total ve8asksk2 p b)*de2 dx1srtical height 4.00 m. The ball hits four times on the way down, each time striking the horizontal part of a different step 1.0 m lower. If all collisions are perfectly elastic, what is the bounce height on thk2*sx1)b dds2a 8sp eke fourth bounce when the ball reaches the bottom of the stairs?
参考答案:
Because all of the collisions are perfectly elastic, no energy is lost in the collisions. With each collision, the horizontal velocity is constant, and the vertical velocity reverses direction. So, after each collision, the ball rises again to the same height from which it dropped. Thus, after five bounces, the bounce height will be 4.00 m, the same as the starting height.
本题详细解析:
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