质量为m的物体在距离地面h高处由静止竖直下落到地面下落的加速度为45g下列说法中错误的是 A.物体的机械能减�15mghb.物体的动能 Template




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tomski质量为m的物体在距离地面h高处由静止竖直下落到地面下落的加速度为45g下列说法中错误的是 a.物体的机械能减�15mghb.物体的动能 coloring