Relativity?

Two springs with spring constants k1 = 1,813 N/m and k2= 1,429 N/m are placed on a smooth horizontal plane. The springs, both relaxed along a line , are attached one after the other and a weight, mass M = 3.7 kg , is attached to the free end of the second spring. The weight is displacet from the equilibrium in the direction of springs. Calculate the the period of the small oscillations of the weight (in s)|||No, this is not a relativity question, but a harmonic oscillation problem.