Question

A boy carries a bag of 500g wt. Calculate the work done by him when he moves 25m in (i) horizontal direction and (ii) vertically upward direction, in SI unit.   ​

Answer 1

Answer:

i) Work done will be zero, because angle between force and displacement is 90 degree and cos 90 = 0

ii) PE = mgh

= 0.5×10×25

= 125 J