Two bars of masses ml and m2 connected by a weightless spring of stiffness x (Fig. 1.39)

Question:

Two bars of masses ml and m2 connected by a weightless spring of stiffness x (Fig. 1.39) rest on a smooth horizontal plane. Bar 2 is shifted a small distance x to the left and then released. Find the velocity of the centre of inertia of the system after bar 1 breaks off the wall.