Momentum Conservation and Collisions Concept?

[x0ji11y]

Homework Statement

A 100 kg man and a 90 kg man are rounding a corner and collide. The heavier man is running, while the 90 kg man is walking. What happens to the momentum of the 100 kg man? Does it increase, decrease, stay the same, or "is conserved"?

Homework Equations

Change in momentum = MV(final) -- MV(initial)

The Attempt at a Solution

Out of the multiple choice answers, I would think that his momentum would decrease because his velocity is decreasing, but I know that in such elastic collisions, momentum is ALWAYS conserved. This is why I'm confused. Any explanation would be greatly appreciated! :)

 

[Galileo]

The total momentum is conserved. All the individual momenta are, generally, not or collisions wouldn't change anything!

 

[x0ji11y]

Thank you very much!