why do you need a reference point to know if an object is moving
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An object is in motion when its distance from another object is changing. 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. You assume that the reference point is stationary, or not moving.
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the negative ions charge is not observed table Number 2.9 be given in chapter 9 motion, chhath Geet
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