Determine the equivalent stiffness and natural frequency of the system shown in Figure 1.2a). The deflection of elastic bar with axial load is Xar=FL/(EA), where E is the Young's modulus and 4 is the sectional area of a bar. The values of physical parameters in this example are: E=E=20010 N/m, 4=1106 m, 4 = 3.4106 m, 1=0.6m, 10.7m, k-110 N/m, k=210 N/m and m=38kg. bomo ww k3 k4 A2, E, 12 A, E, l a) Figure 1.2 +x