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. Velocity is the displacement of an object in a given interval of time.
$Speed = \frac{\text{distance}}{\text{time}}$ $Velocity = \frac{\text{displacement}}{\text{time}}$
Speed is a scalar quantity, i.e., it has only magnitude. Velocity is a vector quantity, i.e., it has both magnitude and direction.

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