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

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

(a) 25%

(b) 33.3%

(c) 75%

(d) 90%

Ans: (c)