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Stationary is only meaningful in regard to a defined "Reference Frame", or "Point of Reference". The object is not moving relative to that Frame or Point.
By the equivalence principles of relativity you do NOThave to choose a stationary point as a reference, Any point in space may be chosen as no point is truly "stationary" and a point that is stationary in one reference frame will be moving in another.
To support you in specifying how the reference point is placed and how the object is moved away from the reference point.
It can be.
The reference point should be stationary, or not moving.
This is usually called a reference point. Frame of reference is not an incorrect term, but it is used less frequently.
This is usually called a reference point. Frame of reference is not an incorrect term, but it is used less frequently.
Stationary
The reference point should be stationary, or not moving.
The reference point should be stationary, or not moving.
A reference point is anything that is stationary. So, if you are on a train you know you have left the station because you moved away from the platform. Hence the platform was stationary.
true