1. The problem statement, all variables and given/known data A pendulum consists of a 0.5 kg bob attached to a string of length 1.6 m. A block of mass m rests on a horizontal frictionless surface. The pendulum is released from rest at an angle of 53° with the vertical and the bob collides elastically with the block. Following the collision, the maximum angle of the pendulum with the vertical is 5.73°. Determine the two possible values of the mass m. 2. Relevant equations Conservation of momentum and energy 3. The attempt at a solution I got 2.16 kg for one...which isn't right.