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Definition of Speed:
The speed of a moving object refers to how fast the object is moving. It is the distance traveled per unit of time.
Definition of Velocity:
The velocity of a moving object is the rate at which the object changes its position.
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Average speed is a quantity that is based upon a measurement of distance and time. Distance is a scalar quantity. Being based upon distance, speed is a scalar quantity as well.
Average velocity is a quantity that is based upon a measurement of displacement (change in position) and time. Displacement is a vector quantity. Being based upon displacement, velocity is a vector quantity as well.
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