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QUESTION
Brett uses a rope and pulley to lift a 75 kg sack 2.0 m onto a truck. He pulls downward on the rope with a force of 2.5 x 10^3 N, what is the...
Brett uses a rope and pulley to lift a 75 kg sack 2.0 m onto a truck. He pulls downward on the rope with a force of 2.5 x 10^3 N, what is the efficiency of the rope and pulley.
