A lift of mass m is moving upwards direction with acceleration g/4 , its displacement is n. find work done by tension force.

Answers (1)

apply force balance 

T-mg=ma=m\frac{g}{4}\Rightarrow T=\frac{5}{4}mg

now work done by T = T-mg=ma=m\frac{g}{4}\Rightarrow T*S=\frac{5}{4}mg*n

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