Which block falls off the table first? - Elastic collision

[garretts16]

Homework Statement

A 2kg block is resting on a frictionless table. It is hit, head on, by a 1kg block heading at 4 m/s. The larger block is sitting 3m from the edge of a 5m long table. The collision happens with the smaller block's distance being 2m from the table and the larger blocks d = 3m from edge. Which block will fall off the table first? It's an elastic collision.

Homework Equations

I used p=mv and 1/2mv^2

The Attempt at a Solution

I was able to fine the momentum before, but I can't solve for the velocities.

 

[vela]

Show your work.