One end of a spring of mass \(m_{s 1}\) and stiffness \(\mathrm{k}_{1}\) is connected to a fixed wall, while the other end is connected to a spring of mass \(m_{s 2}\) and stiffness \(\mathrm{k}_{2}\). The other end of the second spring is connected to a particle of mass \(m\). Determine the equivalent mass of these two springs.