A uniform bar of mass density p per unit volume and length L has a tip mass M. as shown in Fig. 6. With (x) = x/L as the shape function, derive the SDOF equation of motion for free axial vibration of this system. AE = constant. Express your answer in terms of L. A. E, p, M. +uko wwwwwwwwww 4 L Fig. 6.