Define kinetic energy and potential energy. Write an expression for $KE$ of a body of mass $m$ moving with speed $v$. Find the kinetic energy of a stone of $10 \, kg$ moving with a velocity of $10 \, m s^{-1}$.

(N/A) Kinetic energy: The energy possessed by a body by virtue of its motion is called kinetic energy.
Potential energy: The energy possessed by a body by virtue of its position or configuration is called potential energy.
The expression for kinetic energy is $KE = \frac{1}{2} mv^2$.
Given:
Mass $(m)$ = $10 \, kg$
Velocity $(v)$ = $10 \, m s^{-1}$
Calculation:
$KE = \frac{1}{2} \times 10 \times (10)^2$
$KE = 5 \times 100$
$KE = 500 \, J$
The kinetic energy of the stone is $500 \, J$.