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## Homework Statement

Write (11.55) as a system of two first-order differential equations. Also set

up the initial condition for this system

## Homework Equations

mu'' + f(u' ) + s(u) = F(t), t > 0, u(0) = U0, u˙ (0) = V0 .

## The Attempt at a Solution

Hey, I don't know how write a system of two first-order differential equations.

I got the equation in an introduction programming class. Can someone please help me