- #1

bobred

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## Homework Statement

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)

## Homework 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].

## 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