A spring AB of constant k is attached to a support A and to a collar of mass m. The upstre...

A spring AB of constant k is attached to a support A and to a collar of mass m. The upstretched length of the spring is l. Knowing that the collar is released from rest at x = x0 and neglecting friction between the collar and the horizontal rod, determine the magnitude of the velocity of the collar as it passes through point C.