1. The problem statement, all variables and given/known data A 1.0-kg block at rest on a horizontal frictionless surface is connected to an unstretched spring ( k =200 N/m ) whose other end is fixed. A 2.0-kg block whose speed is 4.0 m/s collides with the 1.0-kg block. If the two blocks stick together after the one-dimensional collision, what maximum compression of the spring occurs when the blocks momentarily stop? 2. Relevant equations law of conservation of momentum. 3. The attempt at a solution So far I started off by finding velocity after the collision. Okay, the latex references are god-awful. I used algebra to modify the law of conservation of momentum and plugged in the values required and the velocity when the 2 blocks collide, I got 2.66 m/s . I then used that to calculate the kinetic energy of the masses when collided, and got 10.6J. I just want confirmation that I am on the right track and any other helpers would be greatly appreciated.