Car A (mass = 1000 kg) moves to the right along a level, straight road at a speed of 6.0 m/s. It collides directly with car B (mass = 200 kg) in a completely inelastic collision. What is the momentum after the collision if car B was initially at rest?
A) 10. KN-s to the right
B) 8.0 KN-s to the left
C) 6.0 KN-s to the right
D) 2.0 KN-s to the right
E) zero

Question

Quizplus · Accepted Answer

The initial momentum of the system is the momentum of car A, which is 1000 kg * 6.0 m/s = 6000 kg*m/s (or 6.0 KN-s) to the right. In a completely inelastic collision, momentum is conserved, so the momentum after the collision is also 6.0 KN-s to the right.

Car a (Mass = 1000 Kg) Moves to the Right