1. The problem statement, all variables and given/known data A spring AB or constant k = 2N/m is attached to a support A and to a collar of mass m=1kg. The unstretched length of the spring is 1m, Knowing that the collar is released from rest at x = x0 = 0.9 m 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. here l = 1.2m, 2. Relevant equations T1 + U1-2 = T2 T Kinetic Energy U Potential Energy 3. The attempt at a solution I just wanted to see if the answer is right ??