如图所示固定的光�竖直杆上套着一个�块用轻绳系着�块绕过光�的定�轮以大小恒定的拉力f拉绳使�块从a点起由静止开始上升若从a点上升至 Template




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tomski如图所示固定的光�竖直杆上套着一个�块用轻绳系着�块绕过光�的定�轮以大小恒定的拉力f拉绳使�块从a点起由静止开始上升若从a点上升至 coloring