如图所示一个小球从h=12m高处由静止开始通过光�弧形轨道ab进入半径r=4m的竖直圆环且圆环动�擦因数处处相等当到达环顶c时刚好 Template




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tomski如图所示一个小球从h=12m高处由静止开始通过光�弧形轨道ab进入半径r=4m的竖直圆环且圆环动�擦因数处处相等当到达环顶c时刚好 coloring