Two identcal spiral galaxies A and B w/ equal & opposite momenta merge

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The discussion centers on the merging of two identical spiral galaxies, A and B, which possess equal but opposite momenta. The resultant galaxy, C, is analyzed in terms of its net linear momentum, c. The consensus is that the net momentum c equals zero due to the cancellation of equal and opposite momenta from galaxies A and B. This conclusion is supported by fundamental principles of physics regarding momentum conservation.

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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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As usual, you need to show work.
 
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.
 

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