Question

The kinetic energy of an object of mass $m$ moving with velocity of 5 m/s is 25 J. What will be its kinetic energy when its velocity is doubled?

• A. 1000 J
• B. 25 J
• C. 100 J
• D. 4 J

Answer 1

Answer: (C)

100 J

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

If velocity is doubled the kinetic energy becomes 4 times.

$\therefore$ kinetic energy $=25\times 4=100J$