Question

(1) What is motion. How can you say that "Rest and motion are relative
terms​

Answer 1

Rest and motion are the relative terms because they depend on the observer's frame of reference. So if two different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body.

Answer 2

An object change its position with the respect of time is called motion.

Rest and motion are relative terms because they depend on the observer Fram of reference.

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