Simple Harmonic Motion- Spring problem 1. The problem statement, all variables and given/known data A 12.5 kg mass is suspended on a 1e^5 N/m spring. The mass oscillates up and down from the equilibrium position [tex]y(t)= Asin(wt+\phi)[/tex] Find the amplitude of the oscillating mass Initial position- 4.9 cm Initial velocity= +8.64 m/s Time= 0 2. Relevant equations No idea, see below 3. The attempt at a solution Ok, I found the frequency, which is 89.44 1/s. But, I don't know how to figure out the amplitude of this thing with the information given. I've looked, and I can't find a formula to use. If someone could show me what formula I'm supposed to use, it would be greatly appreciated.