Two identical spiral galaxies with opposite momenta merge

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ritwik06
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Two identcal spiral galaxies A and B with equal but opposite momenta a and b are merged to form a resultant galaxy C with a net linear momentum c. Which is true?
a) c>b
b) 0<c<b
c)c= abs(b)+abs(a)
d) c=0
 
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SpaceTiger said:
As usual, you need to show work.

Well, this question came in my olympiad. If I had got it, i wouldn't have come here. I am a student of 9th. So please at least tell which subject should I refer to.

I think the resultant will be zero becoz there is equal and opposite momenta.