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PhysicsOPhun

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**Two blocks, each with a mass 0.40 {\rm kg}, can slide without friction on a horizontal surface. Initially, block 1 is in motion with a speed v = 1.2 {\rm m/s}; block 2 is at rest. When block 1 collides with block 2, a spring bumper on block 1 is compressed. Maximum compression of the spring occurs when the two blocks move with the same speed, v/2 = 0.60 {\rm m/s}.**

**If the maximum compression of the spring is 1.9 {\rm cm}, what is its force constant?**

**So, I just posted a question but this one seems just like it. I guess I don't understand what effect each force has on one another and where to begin calculating it. Should I be thinking about the work energy theorm? How would I set this problem up? Thanks in advance to any that can tackle this. This by the way is nothing close to what we have been learning but I guess they are trying to challenge us...and I'm very curious**