如图所示,光�水平桌面上的小球被弹出后,经过后落到地面,又被多次弹起,图中虚线为其运动轨迹。下列相关描述正确的是( Template


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tomski如图所示,光�水平桌面上的小球被弹出后,经过后落到地面,又被多次弹起,图中虚线为其运动轨迹。下列相关描述正确的是( coloring