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A block and tackle system of pulleys consisting of 4 pulleys is used to raise a load of 50N through a height of 20m

If the total workdone against friction in the pulleys is equivalent to 800j
Calculate
I.Total workdone by the effort
ii.The efficiency of the system
iii.The effort applied.

2 answers

I. (m * g * h) + 800 j

ii. (m * g * h) / [(m * g * h) + 800 j]

iii. (m * g) / {(m * g * h) / [(m * g * h) + 800 j]}
How?