What are the speed and direction of each ball after the collision?

[RedDanger]

Homework Statement

A 0.060kg tennis ball, moving with a speed of 2.50m/s, collides head-on with a 0.090kg ball initially moving away from it at a speed of 1.15m/s. Assuming a perfectly elastic collision, what are the speed and direction of each ball after the collision?

Homework Equations

mVi + mVi' = mVf + mVf'

deltaP1 = deltaP2

The Attempt at a Solution

I am at a complete loss of how to approach this problem :[

 

[Delphi51]

The first equation is good - fill in the numbers and see what you can find!
Looks like you need to look up "elastic collision" to find out what it means so you can write a second equation.