Define Potential energy. Write the expression of it.

Explanation

(i) Potential energy of an object at a point P is defined as the amount of work done by an extternal force in moving the object at constant velocity from the point O (initial location) to the point P (final location).
(ii) At initial point O potential energy can be taken as zero.
(iii) Mathematically, potential energy is defined as `U = int vec(F)_(a).d vec(r )`
where the limit of integration ranges from initial location point O to final location point P.