、一个质量为1kg的物体被人用手由静止向上提升1m,这时物体的速度是2m/s,则下列说法中错误的是:( )A.手对物体做功12J B.合外力对物体做功12JC.合外力对物体做功2J D.物体克服重力做功
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![、一个质量为1kg的物体被人用手由静止向上提升1m,这时物体的速度是2m/s,则下列说法中错误的是:( )A.手对物体做功12J B.合外力对物体做功12JC.合外力对物体做功2J D.物体克服重力做功](/uploads/image/z/6704710-70-0.jpg?t=%E3%80%81%E4%B8%80%E4%B8%AA%E8%B4%A8%E9%87%8F%E4%B8%BA1kg%E7%9A%84%E7%89%A9%E4%BD%93%E8%A2%AB%E4%BA%BA%E7%94%A8%E6%89%8B%E7%94%B1%E9%9D%99%E6%AD%A2%E5%90%91%E4%B8%8A%E6%8F%90%E5%8D%871m%2C%E8%BF%99%E6%97%B6%E7%89%A9%E4%BD%93%E7%9A%84%E9%80%9F%E5%BA%A6%E6%98%AF2m%EF%BC%8Fs%2C%E5%88%99%E4%B8%8B%E5%88%97%E8%AF%B4%E6%B3%95%E4%B8%AD%E9%94%99%E8%AF%AF%E7%9A%84%E6%98%AF%3A%28%E3%80%80+%29A%EF%BC%8E%E6%89%8B%E5%AF%B9%E7%89%A9%E4%BD%93%E5%81%9A%E5%8A%9F12J+B%EF%BC%8E%E5%90%88%E5%A4%96%E5%8A%9B%E5%AF%B9%E7%89%A9%E4%BD%93%E5%81%9A%E5%8A%9F12JC%EF%BC%8E%E5%90%88%E5%A4%96%E5%8A%9B%E5%AF%B9%E7%89%A9%E4%BD%93%E5%81%9A%E5%8A%9F2J+D%EF%BC%8E%E7%89%A9%E4%BD%93%E5%85%8B%E6%9C%8D%E9%87%8D%E5%8A%9B%E5%81%9A%E5%8A%9F)
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