Question

what is essential to describe the position of an object?

Answer 1

main factors to determine the position of the object are :- observer frame , coordinates , whether the object is at rest or in motion .

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Answer 2

The essential things to describe the position of an object are:
1. Observer
2. Inertial frame Or surroundings.
3. Time
An object is said to be at rest if it does not change its position with respect to time and surroundings.
An object is said to be in motion if it changes it's position with surroundings and time.