如图所示竖直平面内有一半径为r的固定$frac{1}{4}$圆弧轨道与水平轨道相切于最低点b.一质量为m的小物块p从a处由静止�下经过 Template




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tomski如图所示竖直平面内有一半径为r的固定$frac{1}{4}$圆弧轨道与水平轨道相切于最低点b.一质量为m的小物块p从a处由静止�下经过 coloring