The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. The kinetic energy of this bullet in kJ will be:

Question

The momentum of a bullet of mass 20 g fired from a gun is 10 kg m/s. The kinetic energy of this bullet in kJ will be: A. 5 B. 1.5 C. 2.5 D. 25

Philoid · Accepted Answer

Since, Momentum, p = Mass (m) * Velocity (v)

10 = 20v, v = 0.5

We know, K.E. = mv²

= * 10 * (0.5)² = 2.5 J