define reference motion
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Explanation:
Imagine you threw and caught a ball while you were on a train moving at a constant velocity past a station. ... A frame of reference is a set of coordinates that can be used to determine positions and velocities of objects in that frame; different frames of reference move relative to one another
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Explanation:
A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point.
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