19.如图所示质量为m的物体恰好能在倾角为α的斜面上匀速下�如在物体上施加一个力f使物体沿斜面匀速上�为了使得力f取最小值这个力与斜面 Template




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tomski19.如图所示质量为m的物体恰好能在倾角为α的斜面上匀速下�如在物体上施加一个力f使物体沿斜面匀速上�为了使得力f取最小值这个力与斜面 coloring