Why bother using a machine if it cannot multiply work input to achieve greater work output?

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1. Why bother using a machine if it cannot multiply work input to achieve greater work output?Please help; need a original answer
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3. which machine has the highest efficiency machine a has a output work of 750 input work of 1500 b as output work of 1,000 and
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4. percentages:to use a machine,u must do the work on the machine called input work. the machine then foes the work on and object
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