When we work against gravity we measure the potential energy of the body. But to lift the body up from the ground, the body has to be accelerated thus it would have velocity. So, in this case why don't we calculate the change in the kinetic energy of the body instead of potential energy to know how much work is done?
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Work done against gravity in lifting an object becomes potential energy of the object-Earth system. The change in gravitational potential energy, ΔPEg, is ΔPEg = mgh, with h being the increase in height and g the acceleration due to gravity.
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