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Oscillations

The bouncing of a ping pong ball is

a) Harmonic motion b) Periodic motion c) Linear motion d) Circular motion

It is not a linear motion as it goes up and down.
It is not circular .
It is not SHM as restarting force applied being due to gravity is not proportional to negative of displacement which is a requirement for SHM.
It is periodic (neglecting air drag, losses upon bouncing) as the ball reaches the top periodically.
Hence periodic motion is the correct answer.