A body of mass 100 kg is lifted up by 10 m, Find:

(i) The amount of work done.


(ii) Potential energy of the body at their height (value of g = 10 m/s2)

Given,

Mass of the body, m = 100kg


Height, h = 10m


Acceleration due to gravity, g = 10m/s


(i) Work done, w = mgh


= 100 × 10 × 10


= 10,000 J.


(ii) Potential energy, PE = Work done (At any point above the surface of the ground, the work done in raising the body is numerically equal to the potential energy)


Potential energy = 10,000 J


Or, Potential energy = 10KJ


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