A pendulum consists of a 0.4-kg bob attached to a string of length 1.6 m. A block of mass m rests on a horizontal frictionless surface (Figure). 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 massm.

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1.6 m 53 0.4 kg