如图甲所示,一个�轮组竖直固定在天花板上,已知每个�轮均重20n,�轮组下端挂有重为g的物体a,用力f通过�轮组绳的末端竖直�上匀速提升重物a Template




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tomski如图甲所示,一个�轮组竖直固定在天花板上,已知每个�轮均重20n,�轮组下端挂有重为g的物体a,用力f通过�轮组绳的末端竖直�上匀速提升重物a coloring