如图4所示质量为m1的物体a经跨过定�轮的轻绳与质量为m的箱子b相连箱子底板上放一质量为m2的物体c.已知m1<m不计定�轮的质量和�擦 Template




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tomski如图4所示质量为m1的物体a经跨过定�轮的轻绳与质量为m的箱子b相连箱子底板上放一质量为m2的物体c.已知m1<m不计定�轮的质量和�擦 coloring