Momentum Elastic collision

Mass of cart A: 1kg
Mass of Cart B: 3Kg
Spring potential energy: 24 Joules
Two carts are pushed apart when the spring is released.
Thats all the given and i'm suppose to find the final velocity.

I have no idea how to get started.
For me to use Es=(1/2)K*DeltaX^2, i don't have delta x or spring konstant.
For me to use P=M*V, Mass is not give and i dont know the momentum.
The only other equation i have i think that is related to this topic is the impulse equation. F*deltaT= Impulse
 
When i drew the momentum bar graph, i set spring as the impulse so there was no momentum in beging but some at the end.
 
Now i figured out using lol diagram that es would be equal to ek so then Ek=.5*m*V^2 and found the velocity not using the momentum. Anyone think what i did was wrong?
 

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