Write (11.55) as a system of two first-order differential equations. Also set
up the initial condition for this system
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