1. The problem statement, all variables and given/known data A 1.00-kg glider attached to a spring with a force constant 49.0 N/m oscillates on a frictionless, horizontal air track. At t = 0, the glider is released from rest at x = -3.50 cm (that is, the spring is compressed by 3.50 cm). Find the position, velocity, and acceleration as functions of time. (Where position is in m, velocity is in m/s, acceleration is in m/s2, and t is in s. Use the following as necessary: t.) 2. Relevant equations x(t)=Acos(ωt+∅) 3. The attempt at a solution I know that the amplitude is going to be positive 0.035m Thus, x(t)=0.035cos(ωt+∅) Also, ω=√(k/m)=√(49/1)=7rad/s ∴ x(t)=0.035cos(7t+∅) The only thing I am still confused about is how to find ∅...Can anyone help please and thank you?