[SOLVED] More Spring oscillation 1. The problem statement, all variables and given/known data A 2.20 kg mass is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of 17.6 N is required to hold the mass at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis). The mass is now released from rest with an initial displacement of xi = 0.200 m, and it subsequently undergoes simple harmonic oscillations. Calculate the maximum speed of the mass. I've calculated the following already: Spring constant is 88.0 N/m Oscillation frequency is 1.00 Hz 2. Relevant equations This is pretty much the problem; i dont know what equation to use to get the max velocity 3. The attempt at a solution Ive been messing around with V = -AwSin(wt) but i cant fathom how to get amplitude..