1. The problem statement, all variables and given/known data A mass of .59 kg and a velocity of - 0.75 m/s approaches a stationary mass of 0.35 kg that is 53 cm away from the edge of a wall. The stationary (m2) pushes against a spring (elastic collision) that is within the 53cm of separation and reverses direction. How far from the end of the track does the next collision occur? 2. Relevant equations vcm = (m1v1)/M = -0.47m/s 3. The attempt at a solution I think i need to find the time between the first and second collisions, and then use this to find the second xcm (using the vcm I already know), relative to the first collision, and this should get me the answer, but I am not sure how to find the time it takes for the second collision.