Which of the following shows vibration?

Answer: A. Movement of swing

The correct answer is A. Movement of swing.
Vibration is defined as a back-and-forth (to-and-fro) motion around a fixed central point.
A swing moves repeatedly over the same path, making it an example of vibratory or oscillatory motion.
In contrast, a car or bicycle moving on a straight road represents rectilinear motion.
A merry-go-round displays circular motion as it rotates around a central axis

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