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Kinetic energy is the energy an object has due to motion, defined as the work needed to accelerate it from rest to a given velocity and the same work to bring it back to rest, and it is directly proportional to mass and to the square of velocity, with the SI unit the joule. Gravitational potential energy depends on mass, g of 9.81 m/s2, and change in height, and is stored energy due to position relative to other objects, also in joules.

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