第 2 0届全国物理竞赛复赛试卷第七大题原题是 :如图 1所示将一铁饼状小物块在离地面高为h处沿水平方向以初速v0 抛出 .已知物块碰地弹起时沿竖直方向的分速度的大小与碰撞前沿竖直方向的分速度的之比为e(e 1 ) .又知沿水平方向物块与地面之间的动摩擦因数为 μ(μ≠ 0 ) ;每? The seventh topic of the 20th National Physics Contest Rematch Paper was as follows: As shown in Figure 1, a small piece of discus-shaped material was thrown at the initial velocity v0 in the horizontal direction at a height h from the ground. The ratio of the sub-velocity in the vertical direction to the sub-velocity in the vertical direction of the collision front when bouncing up is e(e 1 ). It is also known that the dynamic friction coefficient between the object block and the ground in the horizontal direction is μ(μ≠). 0) ; Each?