1.起重机竖直吊起质量为m的重物,上升的加速度为a,高度为h,则起重机对物体所做的功是:A.mgh B.m(g+a)h/2 C.m(g+a)h D.mgah2.如图,已知F1垂直F2,合力为v0,两力对物体做功分别为3J、4J,则合力对物体做功
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![1.起重机竖直吊起质量为m的重物,上升的加速度为a,高度为h,则起重机对物体所做的功是:A.mgh B.m(g+a)h/2 C.m(g+a)h D.mgah2.如图,已知F1垂直F2,合力为v0,两力对物体做功分别为3J、4J,则合力对物体做功](/uploads/image/z/6985219-67-9.jpg?t=1.%E8%B5%B7%E9%87%8D%E6%9C%BA%E7%AB%96%E7%9B%B4%E5%90%8A%E8%B5%B7%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E9%87%8D%E7%89%A9%2C%E4%B8%8A%E5%8D%87%E7%9A%84%E5%8A%A0%E9%80%9F%E5%BA%A6%E4%B8%BAa%2C%E9%AB%98%E5%BA%A6%E4%B8%BAh%2C%E5%88%99%E8%B5%B7%E9%87%8D%E6%9C%BA%E5%AF%B9%E7%89%A9%E4%BD%93%E6%89%80%E5%81%9A%E7%9A%84%E5%8A%9F%E6%98%AF%EF%BC%9AA.mgh+B.m%28g%2Ba%29h%2F2+C.m%28g%2Ba%29h+D.mgah2.%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5F1%E5%9E%82%E7%9B%B4F2%2C%E5%90%88%E5%8A%9B%E4%B8%BAv0%2C%E4%B8%A4%E5%8A%9B%E5%AF%B9%E7%89%A9%E4%BD%93%E5%81%9A%E5%8A%9F%E5%88%86%E5%88%AB%E4%B8%BA3J%E3%80%814J%2C%E5%88%99%E5%90%88%E5%8A%9B%E5%AF%B9%E7%89%A9%E4%BD%93%E5%81%9A%E5%8A%9F)
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