如图所示某人以拉力f将物体沿固定斜面拉下拉力大小等于�擦力则下列说法中正确的是 A.物体的机械能不变 b.合外力对物体做功为零 C Template




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tomski如图所示某人以拉力f将物体沿固定斜面拉下拉力大小等于�擦力则下列说法中正确的是 a.物体的机械能不变 b.合外力对物体做功为零 coloring