Find the \(i(t)\) that satisfies the following differential equation and initial conditions, when \(K=3,4\), and finally 5 . Identify the Case associated with each value of \(K\). MATLAB would be useful.

\[
\frac{d^{2} i(t)}{d t^{2}}+4 \frac{d i(t)}{d t}+K i(t)=16 u(t), \quad i(0)=0, \quad \frac{d i(0)}{d t}=0
\]