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Answer:

Machines are not 100% efficient because some of the work done by a machine is used to overcome friction. So work output is always less than work input. ... Work: Done by machines is calculates as Mechanical Efficiency which is Work Output divided by Work Input.

Explanation:

auhnikajasman46

Answer:Machines are not 100% efficient because some of the work done by a machine is used to overcome friction. So work output is always less than work input. ... Work: Done by machines is calculates as Mechanical Efficiency which is Work Output divided by Work Input.

Explanation:

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