A body of mass 5 kg is moving with a velocity of 18m/s. Find its kinetic energy.

Given:
Mass, m= 5 kg
Velocity, v= 18 m/s

To find:
Kinetic Energy (K.E)

Solution:
The kinetic energy of a particle is given by $\mathrm{K}.\mathrm{E}=\frac{1}{2}\times {\mathrm{mv}}^2$
$\Rightarrow \mathrm{K}.\mathrm{E}=\frac{1}{2}\times \left(5\right)\times (18{)}^2$
$\Rightarrow \mathrm{K}.\mathrm{E}=\frac{1}{2}\times 5 \times 324$

$\Rightarrow \mathrm{K}.\mathrm{E}=810 \mathrm{J}$

Therefore, the kinetic energy of the body will be 810 J.