Question

A car of mass $1200$ kg is moving with a speed of $81$ km/hr. Calculate its kinetic energy.

Answer 1

Given ,

Mass of car, $m=1200kg$

Speed of car, $v=81km/hr=81\left(\frac{1000}{60\times 60}\right)m/s=22.5m/s$

Kinetic energy , $K=\frac{1}{2}m{v}^2=\frac{1}{2}\times 1200\times {22.5}^2=303750J$