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The mechanical advantage of a machine is...

The mechanical advantage of a machine is 4 and its velocity ratio is 5. What is its percentage efficiency?

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Percentage efficiency = `(M.A.)/(V.R.) xx 100`
Given M.A. = 4 and V.R. = 5
`therefore` Efficiency = `(4)/(5)` = 0.8
Percentage efficiency = `0.8 xx 100 = 80%`
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