[SOLVED] Simple Harmonics 1. The problem statement, all variables and given/known data A 10.0 kg mass is traveling to the right with a speed of 2.40 m/s on a smooth horizontal surface when it collides with and sticks to a second 10.0 kg mass that is initially at rest but is attached to a light spring with force constant 75.0 N/m. How long does it take the system to return the first time to the position it had immediately after the collision? 2. Relevant equations ? 3. The attempt at a solution I am sort of confused about this. I found the f, A, T for subsequent oscillations but whats the difference between them and the first oscilation as asked by this question? Thanks!