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250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be :

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75%

25%

33.3%

90%

answer is C.

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Detailed Solution

Also $\int \vec{F} \cdot \vec{d} r = \frac{1}{2} {mv}^{2}$
$Efficiency = \frac{Useful work}{Total work} = \frac{mgh}{Fd} = \frac{75 \times 9 .8 \times 3}{250 \times 12} = 0 .75$

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