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  1. A force of 250 N is required to lift a 75 kg mass through a pulley system. In order to lift the mass through 3 m, the rope has to be pulled through 12m. The efficiency of system is​
    1. 50%
    2. 75%
    3. ​33%
    4. 90%
Correct Option: B

Efficiency =
output work
input work

i.e. Efficiency


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