ICSE − Q & A

Guys help me with this-

A block and tackle system of 5 pulleys is used to raise a load of 500 N steadily through a height of 20cm. The work done against friction is 2000 J. Calculate:
1) Work done by effort 
2) Efficiency Of system
3) Displacement of the effort applied
4) M.A and V.R

Answers-
1)12000J 
2)83.3%
3)120 N
4) 4.17 and 5

Thanks a lot😁

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