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为什么直接加上2*R*i就可以了呢?

Posted by houzhe at 2021-05-30 14:24:21 on Problem 3684
考虑最下面的球和它上面的球的碰撞。假设最下面的球碰到地面开始向上反弹,此时它上面的球的底部在高度h,那么如果没有半径它们将相遇在底部在h/2的地方,记录此时时间点是t。现在考虑球的半径是r,则相遇时最下面的球的底部在h/2-r的地方,此时最下面的球改变方向向下运行,则在相同的时间点t最下面的底部应该在h/2-2*r的地方。也就是说最下面的球的位置也是改变的,怎么会是按照点计算后结果不变呢?

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