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## Homework Statement

A block on a spring is pulled to the right and released at t=0s. It passes x=3.00cm at t=0.685s, and it passes x=-3.00cm at t=0.886s.

a) What is the angular frequency?

b) What is the amplitude?

## Homework Equations

x(t)=Acos(wt+phi_0)

## The Attempt at a Solution

Since the spring was initially pulled to the right, I assumed that the distance it was pulled would be the amplitude and with the initial conditions x

_{0}=Acos(phi_0)=A, I set phi_0=0. Plugging in the times and positions,

x(t=0.685s)=Acos(0.685w)

x(t=0.886s)=Acos(0.886w).

I tried solving for an equation for A and plugging it into the other equation, but it just ended up looking like a complicated mess. Any insight would be appreciated =)