Question

Rest and motion are relative terms. Explain

Answer 1

Rest and motion are related terms. Without any reference object to relate with it isn't possible to mention whether a object is in rest or motion.
It is best understood through examples-
For example- Let it be that you are travelling in a bus. 
So to you all other passengers are in rest.
However for a person who's outside the bus, everyone inside the bus is moving.
Hence, in the first example when you are the reference object, the passangers are stationary that is in rest.
But on the other hand, when the reference object is a person outside the moving bus, the same passengers are in motion that is moving.

Answer 2

Answer:

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.

Explanation:

When you are driving a car, the car is said to be in motion because it is moving relative to the road but you are said to be at rest because you are at rest relative to the moving car.