说明：   小球落地弹跳过程仿真。 可以在界面中输入小球的初始高度，初速度，落地弹跳后的能量损失，重力加速度等参数来显示小球的运动轨迹。
(bouncing ball landed process simulation. The input interface of the initial ball high early speed, bouncing landing after the energy losses gravity parameters to show the ball trajectory.)