Answer:
Suppose
a body of mass m is lifted vertically upwards through a distance h. In this
case, the force required to lift the body will be equal to weight of the body, mg
(where m is mass and g is acceleration due to gravity). Now, Work done in
lifting a body = Weight of body X Vertical distance
W = mg x h = mgh
Where W = Work done, and h = Height through which the body
is lifted.
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