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250 N force is required to raise 75 kg m...

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 : -

A

`25%`

B

`33.3%`

C

`75%`

D

`90%`

Text Solution

Verified by Experts

The correct Answer is:
C
`eta="useful work"/"total work"="mgh"/"F x d"=((75g )xx3)/(250xx12)=0.75`
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