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sxdsouls:

Lucy needs to lift a crate to a shelf 20 m high. She does 12,000 J of work on a machine to help her. The machine exerts a force of 500 N to lift the crate. What is the efficiency of the machine? 4.2% 24% 58% 83%

XxAngelGirlxX:

Answer:83.34% Explanation: Given that, Lucy does 12000 J of work on a machine to help herThe machine exerts a force of 500 N to lift the crate.

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