8.如图所示粗糙的$frac{1}{4}$圆弧的半径为045m有一质量为02kg的物体自最高点a从静止开始下�到圆弧最低点b时然后 Template




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tomski8.如图所示粗糙的$frac{1}{4}$圆弧的半径为045m有一质量为02kg的物体自最高点a从静止开始下�到圆弧最低点b时然后 coloring