Physics, 12.02.2021 01:10, fffcc7665

A stage crew member uses a pulley system to lift scenery for the school play. If he does 850 J of work and the pulley system does 710 J of work, what is the efficiency of the pully system?

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A stage crew member uses a pulley system to lift scenery for the school play. If he does 850 J of w...