把小球放在大球顶上,然后把这二者组成的连体从高度 h 处释放,见图1。当连体物撞击地面时,便会发生戏剧性的结果.小球将会弹起来,直跳到九倍 h 的高度.为什么?当这个连体物刚一接触地面,大球就以速度 v 向上运动,这时小球仍以速度 v 向下运动.这同一个速度 v由 Put the ball on the top of the big ball, and then release the combination of the two from the height h, see Figure 1. When the Siamese hits the ground, a dramatic result will occur. The ball will bounce up and jump up to nine times the height of h. Why? When this Siamese touches the ground, the big ball moves up at speed v. Movement, when the ball is still moving with speed v down. This same speed v is