The roots of polynomial $ p(s) $ are:
$$ \begin{aligned}s_1 &= -1.3387\\[1 em]s_2 &= 1.6694+2.164i\\[1 em]s_3 &= 1.6694-2.164i \end{aligned} $$Polynomial $ s^3-2s^2+3s+10 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.