6.60 Show that the natural frequencies of the system shown in Fig. 6.6(a), with k = 3k, k2 = k3 = k, m = 4m, m2 = 2m, and m3 = m, are given by w = 0.46/k/m, w = k/m, and w3 = 1.34k/m. Find the eigenvectors of the system. m1 -x1 (a) m2 -x2 -X3 k3 000 m3