Resonant angular frequency and amplitude

A body of mass $0.25\mathrm{kg}$, attached to an ideal spring of constant $100N/m$ and subject to a viscous force with $b=0.50kg/s$, is driven by a force $F_0\cos (\Omega t)$ with $F_0=1.0\mathrm{N}$. Determine the resonant angular frequency and the maximum amplitude of the steady state.