9.如图2所示在光�水平面上一小球以某一 速度运动到 A点时遇到一段半径为r的14圆弧曲面ab后落到水平地面的c点已 知小球没有跟圆弧 Template




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tomski9.如图2所示在光�水平面上一小球以某一 速度运动到 a点时遇到一段半径为r的14圆弧曲面ab后落到水平地面的c点已 coloring