本题目来源于试卷: gc textbook chapter 7 Linear Momentum，类别为 通用国际物理
[问答题]
A golf ball rolls off the top of a flight -ym l52bs+c . ltd0zei-7tteeof concrete stepsaq4 / qbyfl -4fvg1y6c of total vertical height 4.00 m. The ball hits four times y4y4ff q1b 6gq-lcav/ 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 the 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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