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

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When two identical spiral galaxies A and B with equal and opposite momenta merge, the resultant galaxy C has a net linear momentum that is zero. This is because the opposing momenta cancel each other out, leading to c=0. The discussion highlights the importance of understanding momentum in physics, particularly in astrophysical contexts. The original poster seeks guidance on which subject to study to better grasp these concepts. The consensus is that the resultant momentum of the merged galaxies is indeed zero.
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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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