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## Homework Statement

An oscillating system of a block attached to a string where k = 400 at some time t has a position x of 0.1 m, velocity of -13.6 m/s, and accel. of -123 m/s^2. Find the amplitude of the motion. Do not use energy.

## Homework Equations

x = Acos(wt + phi)

v = -Awsin(wt + phi)

a = -Aw^2cos(wt + phi)

## The Attempt at a Solution

I can solve for omega by using sqrt(-a / x), we still have 3 unknowns A, t, and phi. We have 3 equations, but they are not linear equations so I don't know how to solve them simultaneously. What other method is there that I can use since I can't use energy?