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. Objects that we call stationary such as a tree, a sign, or a building make good reference points.
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Answer:
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. Objects that we call stationary such as a tree, a sign, or a building make good reference points.
Explanation:
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