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一、问题的提出有这样一道题:“在一光滑的水平面上有一个300克的小球以8米/秒的速度向前滚动,撞上前面一个500克的球,这个球原来是以4米/秒的速度和第一球同向滚动的。碰撞后第一球以2米/秒速度向后退回,求第二球碰撞后的速度。”解:根据动量守恒定律:
First, the question is raised: “A 300 g ball is rolling forward at a speed of 8 meters per second on a smooth level and it hits a 500 gram ball in front. At a speed of 4 m/s, the first ball rolls in the same direction. After the collision, the first ball retreats back at a speed of 2 m/s to find the speed at which the second ball collides.” Solution: According to the law of conservation of momentum: