1. The problem statement, all variables and given/known data A mass on a spring obeys SHM.Given that the mass is initially at the equilibrium position,has an initial velocity of 2m/s,and a nastural frequency of 2 rad/s,Find A and φ After 13.2 sec whats the displacement of the mass 2. Relevant equations ψ=Αcos(ωt+φ) 3. The attempt at a solution Is the initial velocity ,the maximum velocity ? Maybe yes. Is the initial phase (φ) zero ? I think so.