(A) Motion is defined as the change in the position of an object with respect to time and a reference point (observer). If a body does not change its

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$A$ change in the position of an object with respect to time.

(A) Motion is defined as the change in the position of an object with respect to time and a reference point (observer). If a body does not change its position relative to its surroundings over time,it is said to be at rest. If it does change its position,it is said to be in motion.