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# A pulley system has an efficiency of 87.5 percent. how much of the rope must be pulled in if a force of 648 n is needed to lift a 150 kg desk 2.46 m? (disregard friction.)

A pulley system has an efficiency of 87.5 percent. how much of the rope must be pulled in if a force of 648 n is needed to lift a 150 kg desk 2.46 m? (disregard friction.)