Any object that is higher than ground level in earth's gravitational field has potential energy stored in it.
Examples:
1. A plane or bird in the sky
2. A parachutist
3. Water stored in a dam, or water tanks at some height above earth's surface
4. A satellite orbiting Earth
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They're hardly ever equal. One of the few situations where they're equal is when you drop a weight to the ground from some height. Then, the gravitational potential energy and kinetic energy are equal when it's exactly in the middle of the drop, and the kinetic energy it has when it hits the ground is the same as the gravitational potential energy it had when you let it go.
An advantage for gravitational energy is that gravitational energy is that it can be made/created very easily and transformed easily as well
GPE = Weight * Height (in suitable units) where the height is measured from some arbitrary reference point.
A book, no matter where it sits, is an organized and bound assembly of paper with information stored on it. The book has some mass, and like any mass, its gravitational potential energy relative to the floor can be defined in terms of its mass and its distance above the floor.
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