What is necessary to describe the state of rest or motion of an object?

Object's speed

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Object's size

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Object's mass

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A reference point

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Solution

The correct option is D A reference point
The state of rest or motion of an object is defined using a reference point. The reference point is a point used to describe the location of something. An object is said to be in motion, if it changes its position relative to the reference point. The mass, volume and size of the object are not necessary to describe whether the object is at rest or in motion.

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