How Does a Spring Affect Cart Velocity After Collision?

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If two carts collide and cart 1 has a spring on it, how can I figure out the final velocity of the first cart?
 
on Phys.org
What's conserved?
 
kinetic energy and momentum
 
what's throwing me off is the spring...

the carts are initially at rest together, then the spring on cart 1 is released.
 
louise82 said:
the carts are initially at rest together, then the spring on cart 1 is released.
I thought you said they collided?

louise82 said:
kinetic energy and momentum
Momentum, yes. Kinetic energy, no. (They start at rest, then begin to move.) Hint: Consider the energy stored in the compressed spring.
 
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