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## Homework Statement:

- Waves and oscillations

## Relevant Equations:

- 2nd Newton's Law.

I need to find the differential equations for each mass. ##y_1## is the equilibrium position, and ##y_2## is the second equilibrium position for each mass.

I was thinking consider the next sistem:

\begin{eqnarray}

k\Delta y-mg&=&m\frac{d^2 y_2}{dt^2}

\\ -2k\Delta y_1 -k\Delta y_2 -2mg &=&m\frac{d^2 y_1}{dt^2}

\end{eqnarray}

But i'm not sure , anybody can help me please??

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