《2005年物理高考科研测试(二)》中有这样一道题:在离地面某一高度处有一质量为m1的小球1,在其正下方地面处有另一小球2,现令球1从静止出发开始下落,同时令小球2以某一初速度竖直上抛,使上、下两球在空中相碰,相碰处离地面的高度为小球1落前高度的34,如图1所示.碰的时间极短,且 “Physical examination in the physical examination in 2005 (2)” has such a question: There is a ball with a mass of m1 at a certain height from the ground, and there is another small ball 2 at the ground just below it, now the ball 1 Starting from the beginning of the descent, let the small ball 2 throw up at a certain initial speed and make the upper and lower balls collide in the air. The height of the collision between the ball and the ground is 34, which is the height of the ball 1 falling forward. As shown in Figure 1, the touch time is very short, and