Question

a scrow jack whose pitch is 2mm is used to raise a motor car of mass 900kg through a height of 200cm the length of the tommy bar of the jack is 40cm and if the jack is 60% efficience.calculate;
(a)velocity ratio(b)machanical advantage(c)calculate the effort (d)workdone by the effort(g=10m/s)

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Please help me to solve that physics question and please it should be step by step so that I will understand it
Am waiting oooo

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