1. The problem statement, all variables and given/known data A spring mass system has the following parameters: Mass m=1 kg, spring constant k=100 N/m. The oscillations are started by initially displacing the mass so that the spring is compressed by 0.5 cm and releasing it from rest. What is the speed of the mass (in m/s) when it crosses the equilibrium position? 2. Relevant equations x(t)=A sin(wt+phi) v(t)=Aw^2 cos(wt+phi) 3. The attempt at a solution Ok, so the spring is compressed by 0.5 cm from its equilibrium position. So when x(t)=0.5 cm, v(t)=0 at t=0 after solving the equation for motion x(t) I got that A=0.5 cm I don´t know what is next, can somebody help me?