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Physics, 17.01.2020 19:31 weridness80

Lucy needs to lift a crate to a shelf 20 m high. she does 12,000 j of work on a machine to her. the machine exerts a force of 500 n to lift the crate. what is the efficiency of the machine?
a. 4.2%
b. 24%
c. 58%
d. 83%

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