如图所示从a点由静止释放一弹性小球一段时间后与固定斜面上b点�生碰撞碰后小球速度大小不变方�变为水平方�又经过相同的时间落于地面上c Template




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tomski如图所示从a点由静止释放一弹性小球一段时间后与固定斜面上b点�生碰撞碰后小球速度大小不变方�变为水平方�又经过相同的时间落于地面上c coloring