Two 5000-kg rail cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple, and roll together with a combined momentum of
A. zero.
B. 5000 kg m/s.
C. 10,000 kg m/s.
D. 15,000 kg m/s.
Answer:B
Two 5000-kg rail cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple, and roll together with a combined momentum of
A. zero. B. 5000 kg m/s. C. 10,000 kg m/s. D. 15,000 kg m/s.