Moving Objects and Observational Frames of Reference
Next, it is observed that time varying coordinates are used in both inertial and non-inertial frames of reference, so the use of time varying coordinates should not be confounded with a change of observer, but is only a change of the observer's choice of description. Elaboration of this point and some citations on the subject follow.
Read more about this topic: Mechanics Of Planar Particle Motion
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