用50n的力拉一个质量为10kg的物体在水平地面上前进如图所示若物体前进了10m拉力f做的功为400j重力做的功为0j如果物体与水平 Template




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tomski用50n的力拉一个质量为10kg的物体在水平地面上前进如图所示若物体前进了10m拉力f做的功为400j重力做的功为0j如果物体与水平 coloring