Completely inelastic collision with object attached to spring

1. The problem statement, all variables and given/known data

In Fig. 9-64, block 2
(mass 1.0 kg) is at rest on a
frictionless surface and touch-
ing the end of an unstretched
spring of spring constant 200
N/m. The other end of the spring is fixed to a wall. Block 1 (mass 2.0 kg), traveling at speed v1 = 4.0 m/s, collides with block 2, and the two blocks stick together. When the blocks momentarily stop, by what distance is the spring compressed?

2. Relevant equations

m1v1+m2v2=MV where M is the mass of the system and V is the velocity of the system

Hooke’s Law: F = kx

3. The attempt at a solution

I was able to find the final velocity of the system:

V = (m1v1)/(m1+m2) = 2.974

How do I get from there to the distance that the spring is compressed?

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