Two 5000-kg rail cars roll without friction (one at 1 m/s, the ...

[hbsimmons88]

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.

Question 2

A sandbag motionless in outer space is hit by a three-times-as massive sandbag moving at 12 m/s. They stick together and move at a speed of
 
  A) 3 m/s.
  B) 4 m/s.
  C) 6 m/s.
  D) 8 m/s.
  E) none of the above

[fraziera112]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: E