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Use this tag for questions related to how objects move relative to other objects dependent on your frame of reference, and how this applies to special relativity.
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In galilean relativity, is an observer assumed to be at rest only to simplify calculations, ...
I am a beginner in Physics and my teacher taught us "Relative Motion" yesterday. He said that the "Observer is assumed at rest." Is the observer assumed to be at rest only to simplify calculations, o …