Question

When speed of a motor car increases six times, then its kinetic energy increases by:

• A. 6 times
• B. 36 times
• C. 12 times
• D. 24 times

Answer 1

The correct option is B 36 times

Let initial speed of the car be $v$ m/s and mass be $m$ kg
Using the equation
$K.E.=\left(m{v}^2\right)/2$
It can be observed that, if we increase the speed ($v$) by 6 times the kinetic energy will increase by 36 times.