Derive an expression for gravitational potential energy of an object?

1.	Derive an expression for gravitational potential energy of an object?
Answer» We know that every object on the surface of the Earth is attracted by the Earth.So,if an object has a mass\'m\',it will experience a force that is called the weight of the object which acts vertically downwards.To move this object upward from \'a\' to\'b\' through a distance \'h\', we must apply a force \'f\' upward were F=MgW=Fh, but as F=Mg,W=mgh -------(1)This work done on the object which changes its position is called the Gravitational Potential Energy. Then:Ep=w-------(2)From (1) & (2), we get:Ep=mgh

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