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

This is an exam prep question

Particle A has mass 3m and velocity i + 2j, it collides with particle B mass m velocity -i + j. Collision is elastic. After collision Particle A is observed to be moving along the +ve y-axis. Find the final speeds of the two particles.(two possible cases)

2. Relevant equations

Being elastic the kinetic energy is the same before the collision and after.

We are given the answers ([tex]3/2,\sqrt{41}/2[/tex] or [tex]2,\sqrt{5}[/tex].

3. The attempt at a solution

Could someone give me a little nudge in the right direction? I can't see where to begin, what is the state of B after the collision?

Thanks

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# Homework Help: Elastic collision

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