Find the first natural frequency (smallest value) for the free system of a two degree of freedom as shown in the figure with k1= 50, k2 =10, k3=8, m1=20, m2-2 and all the dampers are negligible. All values are using standard units. Write your answer up to 3 decimal places. Answer: x₁(1) -fi(t) my -12(1) m2