4.如图所示一小球在光�水平面上从a点开始�右运动经过2.5s后与距离a点5m的竖直墙壁碰撞若碰撞时间极短可忽略不计碰后小球返回整个 Template




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tomski4.如图所示一小球在光�水平面上从a点开始�右运动经过2.5s后与距离a点5m的竖直墙壁碰撞若碰撞时间极短可忽略不计碰后小球返回整个 coloring