如图所示一辆拖车通过光�的定�轮将一重物g匀速提升当拖车从a点水平移动到b点时位移为s绳子由竖直变为与竖直方�成θ的角度求拖车对重物 Template




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tomski如图所示一辆拖车通过光�的定�轮将一重物g匀速提升当拖车从a点水平移动到b点时位移为s绳子由竖直变为与竖直方�成θ的角度求拖车对重物 coloring