Momentum question details inside.?

Question

An object of mass 2kg travels east at 5m/s and crash in an object of 10kg traveling west at 1m/s.
A)What would be the final velocity if the objects stuck together?
B)What is the momentum of the 2kg object before the collision?
C)What is the total momentum after the collision?
D)Does this contradict the law of conservation of linear momentum?

Answer 1

Momentum conservation !
Make the eastward direction to be the positive direction.
2kg*5m/s - 10kg*1m/s = 0
A) 0 m/s
B) 10 kg*m/s
C) 0
D) No. Momentum conservation for the system, not for a particle involved in the collision.