Question

define kinetic energy and give the expression along with unit

Answer 1

energy which a body possesses by virtue of being in motion.

Kinetic energy is usually measured in units of Joules (J)

Answer 2

Kinetic Energy- Expression and Unit

Solution:

The kinetic energy is a form of energy which is acquired only when the body is in state of kinetics.

K.E = $\bold{\frac{1}{2} m v^{2}}$

The energy is the state of a body which can perform any work. One such energy is the kinetic energy. Kinetic energy is the energy acquired by the body when the body is in motion. Every moving body has kinetic energy.  

It is a vector quantity and has S. I. unit of Joule. The other unit of Kinetic energy is erg.