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GPE is energy a body has by virtue of its position in a gravitational field. if the field is uniform (as near the surface of the Earth) then the work done to raise a body to a particular height above the earth is the same as the GPE gained by the body.

Work done = force x distanced moved along the line of the force, W=Fd

In this case, the force is the weight mg of the body and distance = height h above the Earth, so GPE = mgh

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Q: What is gravitational potential energy deduce an expression for it?
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