Question

250 N force is required to raise 75 kg mass from a pulley. If the rope is pulled 12 m and the load is lifted to 3 m then the M.A is (g= 10 m s-2)​

Answer 1

Answer:

Height lift was h=3m

Work done by the force is

=>W=Fd

=>250×12

=>3000Joule

Work against the gravity

i.e. increase in potential energy of the mass is E=mgh=75×10×3=2250Joule

so efficiency will be

=>η×100=E/W×100% = 75%

Explanation:

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