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Definition of Speed:
The speed of a moving object refers to how fast the object is moving. On average, it is the distance traveled per unit of time.
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An object that has a nonzero speed is an object that is moving. A moving object is not staying in place; its position is changing. An object that is moving with a constant speed is moving the same distance every 1-second interval or every 0.5-second interval. Such an object is changing its position by the same amount in each constant interval of time
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