1. The problem statement, all variables and given/known data A mass/spring system is set in motion. Find the phase constant with the given information. Given: k = 8 N/m (spring constant) m = 0.1 kg (mass attached to string) x0 = -0.12 m (position at t = 0) v0 = 0.9 (velocity at t = 0) 2. Relevant equations x(t) = xmcos(ωt + Φ) v(t) = -ωxmsin(ωt + Φ) k = mω2 3. The attempt at a solution I first solved for ω using the given spring constant and mass: ω = √(k / m) = √(8N/m / 0.1kg) = 8.94 rad/s At t = 0, x(0) = xmcos(Φ) v(0) = -ωxmsin(Φ) Unfortunately, this was where I became stumped. I don't know how to find the amplitude(xm) which is the only thing I needed to solve for the phase constant. Any hints to what I should do?