Inellastic collisison

I have struggled with this question. I don’t understand what do especially that the question says inelastic but there is a spring.

A mass of 12 kg is sliding along a frictionless surface at a speed of 5 m/s.
It collides perfectly inelastically with a stationary mass of 24 kg which is attached to
a spring. If the spring constant is 225 N/m, where are the stuck-together masses 3
seconds after the collision?

I know momentum before collision is 12*5= 60

But I don’t know what to do from here … I know momentum has to be conserved but not energy but I am having trouble understanding what can the next step be.

I hope someone can help me.

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