8.4 Exercise 19

Mass A (1.0 kg) slides across a frictionless surface with a velocity of 8 m/s in the positive direction. Mass B (3.0 kg) is initially at rest. The two objects collide and stick together. What will be the change in the center-of-mass velocity of the system as a result of the collision?

1. There will be no change in the center-of-mass velocity.
2. The center-of-mass velocity will decrease by 2 m/s.
3. The center-of-mass velocity will decrease by 6 m/s.
4. The center-of-mass velocity will decrease by 8 m/s.