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Distinguish between speed and velocity.

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Speed Velocity
Speed is the distance travelled by an object in a given interval of time. It does not have any direction. Velocity is the displacement of an object in a given interval of time. It has a unique direction.
The speed of an object can never be negative. At the most, it can become zero. This is because distance travelled can never be negative. The velocity of an object can be negative, positive, or equal to zero. This is because displacement can take any of these three values.
 
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Speed has only magnitude while velocity has both magnitude and direction. So speed is a scalar quantity but velocity is a vector quantity.

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