A bullet of mass 0.010 kg and speed of 200 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. This process takes 0.02 second. The magnitude of the impulse delivered to the bullet by the block during this time is
A) zero.
B) 0.98 N.
C) 1.0 Ns.
D) 2.0 Ns.
E) 4.0 Ns.

Question

Quizplus · Accepted Answer

Impulse is the change in momentum. The initial momentum is 0.010 kg * 200 m/s = 2.0 kg*m/s, and the final momentum is 0 since the bullet is at rest. Thus, the impulse is 2.0 Ns.

A Bullet of Mass 0