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What do you mean by efficency of simple machine is 80%?what is ouput work​

What do you mean by efficency of simple machine is 80%?what is ouput work​
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What do you mean by efficency of simple machine is 80%?what is ouput work​

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User Clement
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It means that machine can do work up to 80% and 20% of the energy is wasted on friction

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User Bev
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