The magnitude of gravitational potential energy is equivalent to amount of work done by weight of the body. potential energy is expressed as mgh where m is mass, g is gravitational acceleration and h is height. the potential energy of body can be positive or negative ?
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If an object is lifted, work is done against the force of gravity. When work is done energy is transferred to the object and it gains gravitational potential energy. If the object falls from that height, the same amount of work would have to be done by the force of gravity to bring it back to the Earth's surface.
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