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【简答题】
光滑的水平桌面上放置一固定的圆环,半径为R。一质量为m的物体贴着圆环内侧运动(如图),物体与圆环间的滑动摩擦系数为 。设物体某一时刻在A点的速率为 ,求此后t时刻物体的速率以及从A点开始经过的路程。
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