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Q: The speed of the boy sitting on the swing is…
  • A. uniform
  • B. circular
  • C. uneven
  • D. periodic
Correct Answer: Option D - The speed in which an object or body repeats itself at a fixed time interval and on a certain path is called periodic motion. Example- The speed of the boy sitting on the swing.
D. The speed in which an object or body repeats itself at a fixed time interval and on a certain path is called periodic motion. Example- The speed of the boy sitting on the swing.

Explanations:

The speed in which an object or body repeats itself at a fixed time interval and on a certain path is called periodic motion. Example- The speed of the boy sitting on the swing.