A rifle fires a bullet. Immediately after the bullet is fired, which of the following is not true?
A) The rifle and the bullet have the same magnitude of momentum.
B) The force on the rifle due to the bullet and the force on the bullet due to the rifle have the same magnitude.
C) The impulse on the rifle due to the bullet and the impulse on the bullet due to the rifle have the same magnitude.
D) The rifle and the bullet have the same kinetic energy.

Question

Quizplus · Accepted Answer

The rifle and the bullet do not have the same kinetic energy immediately after the bullet is fired. The bullet has a much higher velocity than the rifle, which means it has a higher kinetic energy as KE = 1/2 mv^2.

A Rifle Fires a Bullet