(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

2. Relevant equations

1/2m_{1}v_{1}^{2}+ 1/2m_{2}v_{2}^{2}= 1/2m_{1}v_{1f}+ 1/2m_{2}v_{2f}

m_{1}v_{1}+ m_{2}v_{2}= m_{1}v_{1f}+ m_{2}v_{2f}

v_{1}- v_{2}= -(v_{1f}- v_{2f})

3. The attempt at a solution

So I solved the momentum of conservation for the final velocity of object 1. I then plug that equation into the third equation listed above, as v_{1f}. But the thing is the equation i get for v_{1f}has v_{2f}in it and that is what I am solving for and this is where I am stuck.

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# Homework Help: Finding speed of objects after elastic collison

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