Magnitude of final velocity. Due today

[kdizzle711]

Homework Statement

A glider of mass 0.143 kg is moving to the right on a frictionless, horizontal air track with a speed of 0.750 m/s. It has a head-on collision with a glider 0.303kg that is moving to the left with a speed of 2.13 m/s. Suppose the collision is elastic.

Homework Equations

MaVa1+MbVb1=MaVa2+MbVb2
1/2MaVa1^2+1/2MbVb1^2=1/2MaVa2^2+1/2MbVb2^2

The Attempt at a Solution

Where do I start with this? I have all of the left side of the equations, but nothing on the right

 

[Astronuc]

One is supposed to find the velocities after the collision perhaps?

What is the significance of the elastic collision?

Here's some useful information -
http://hyperphysics.phy-astr.gsu.edu/hbase/elacol.html

http://hyperphysics.phy-astr.gsu.edu/hbase/colsta.html#c5