What is the difference between speed and velocity?

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Speed and velocity may seem like identical measures but this is not the case. Speed is a scalar measurement meaning it only takes into account magnitude not direction, velocity is a vector quantity and therefore describes speed in a specific direction. For example:

If a car is moving along a road, which we take as the positive direction, at 5 ms-1 then it has a velocity of 5ms-1 and a speed of 5ms-1 . However if the car was moving backwards along the road at 5ms-1 it would have a speed of 5ms-1 but a velocity of - 5ms-1.

As scalar quantities are only concerned with magnitude not direction they can't be negative.

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