Define kinetic energy. Give its unit and dimensional formula and mention works by using it.

(N/A) The energy of a body is the ability (or capacity) of the body to do work.
Half of the product of the mass of a body and the square of its velocity is defined as kinetic energy $(K)$ of the body.
$\therefore K = \frac{1}{2} mv^2$,where $m$ is the mass of the body and $v$ is the velocity or speed of the body.
The unit of kinetic energy is the same as the unit of work. Its $SI$ unit is Joule $(J)$ and its $CGS$ unit is erg. The dimensional formula of kinetic energy is $[M^1 L^2 T^{-2}]$.
Kinetic energy is a scalar quantity. It indicates the magnitude of work that a body can perform due to its motion.
Examples of work done using kinetic energy:
$1$. The kinetic energy of a fast-flowing stream has been used to grind grains.
$2$. Sailing ships employ the kinetic energy of the wind.
$3$. Electricity is generated by wind mills using the kinetic energy of air.