Question

If the speed of a car become $2$ times, then its kinetic energy becomes

• A. $4$ times
• B. $8$ times
• C. $6$ times
• D. $2$ times

Answer 1

The correct option is A $4$ times

We know that, kinetic energy,

$E=\frac{1}{2}m{v}^2$

For same mass, $E\propto v^2$

Therefore, if speed is increased by $2$ times, then the kinetic energy will increase by $4$ times.