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Potential energy

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(i) ''Potential energy of an object at a point P is defined as the amount of work done by an external force in moving the object at constant velocity from the point O (initial location ) to the point P (final location).
(ii) Mathematically, potential energy is defined as `U = int vecF_a.d vec r` where the limit of integration ranges from intitial location point O to final location point P.
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