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**1. Homework Statement**

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. Homework Equations**

Conservation of momentum and energy

**3. The Attempt at a Solution**

I got 2.16 kg for one...which isn't right.