- #1

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## Homework Statement

## Homework 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})

## 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.