Question

A car is moving at $100km/h$. If the mass of the car is $950kg$, Its kinetic energy is:

• A. $367MJ$
• B. $0.367MJ$
• C. $3.67MJ$
• D. $3.67J$

Answer 1

The correct option is B $0.367MJ$

Mass of the car, $m=950kg$

velocity of the car, $v=100km/h=(100\times \frac{5}{18})$m/s.

kinetic energy $KE=\frac{1}{2}\times m\times v^2$
$=\frac{1}{2}\times 950\times {(100\times \frac{5}{18})}^{2}J$
$=366512.35J=0.367MJ$.

Hence, the kinetic energy of the car is 0.367 MJ.