16.如图所示位于竖直平面内有14圆弧的光�轨道半径为rob沿竖直方�圆弧轨道上端a点距地面高度为h当把质量为m的钢球从a点静止 Template




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tomski16.如图所示位于竖直平面内有14圆弧的光�轨道半径为rob沿竖直方�圆弧轨道上端a点距地面高度为h当把质量为m的钢球从a点静止 coloring