Question

b. Define periodic motion ?​

Answer 1

Explanation:

Any motion of a system that is continuously and identically repeated. The time T that it takes to complete one cycle of an oscillation or wave motion is called the period, which is the reciprocal of the frequency. See pendulum; simple harmonic motion. From: periodic motion in A Dictionary of Physics.

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Answer 2

Answer:

motion that is repeated after a regular interval of time s known as periodic motion.

Explanation:

eg rotation of earth ,revolution of earth etc