1. The problem statement, all variables and given/known data a 200g mass attached to a horizontal spring oscillates at a frequency of 2.0 Hz. At t=0s, the mass is at x=5.0 cm and has v=-30 cm/s. Determine: a) period b)angular frequency c) AMPLITUDE 2. Relevant equations x(t)=Acos(wt+psi) v(t)=-Awsin(wt+psi) w=2*pi*f T=1/f 3. The attempt at a solution I have solved for the period=1/2 s I have also solved for angular frequency=2*pi*2=4*pi However, I am confused about solving for amplitude. I thought that I could plug in 0.05 m and 0s to the x(t) formula, but I do not know psi (phase constant) so I am stuck.