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【简答题】
一质量为M具有半球形凹面的物体，静止在光滑水平桌面上，如图所示，凹球面的表面也是光滑的。今在凹面的上缘B处放置一质量为m的小球，释放后小球开始下滑。试求当小球下滑至凹面最低处A时，凹面体对小球的作用力。
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