如图所示小明用�轮组匀速提起一个重为600n的物体a物体 上升的速度为01m/s人拉绳的力为250n不计绳重和�擦人拉绳做功的功率 Template




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tomski如图所示小明用�轮组匀速提起一个重为600n的物体a物体 上升的速度为01m/s人拉绳的力为250n不计绳重和�擦人拉绳做功的功率 coloring