Question

give an example to justify that rest and motion are relative

Answer 1

Rest and motion are the relative terms because they depend on the observer’s frame of reference.
If an observer is at rest in his or her own frame of reference, but he may be moving in other observer's frame of reference. So if two different observers are not at rest with to each other, then they too get different results when they observe the motion or rest of a body.

hope it helps...

Answer 2

a person in moving bus is in state of rest with respect to another person in same bus but the same person in in motion with respect to a person standing on road