如图所示用200n的拉力拉着物体a在水平面上匀速前进物体b以01ms的速度匀速前进.若a与�轮相连的绳子c受的拉力大小是140n不计 Template




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tomski如图所示用200n的拉力拉着物体a在水平面上匀速前进物体b以01ms的速度匀速前进.若a与�轮相连的绳子c受的拉力大小是140n不计 coloring