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**Driven, damped oscillator - URGENT!**

## Homework Statement

A driven, undamped oscillator has an amplitude of 3.0cm at a driving frequency of 9 rad/s and an amplitude of 2.4cm at a driving frequency of 7 rad/s. What is the resonant frequency of the oscillator?

## Homework Equations

A = (F0/m)/(w0^2-w^2)

## The Attempt at a Solution

My prof. gave me the above formula as a hint, but I have no idea where to start from and what to do. Thanks for the help!