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the short answer is that velocity is the speed with a direction, while speed does not have a direction.Speed is a scalar quantity -- it is the magnitude of the velocity. Speed is measured in units of distance divided by time, e.g. miles per hour, feet per second, meters per second, etc....Velocity is a vector quantity -- when giving the velocity we must specify the magnitude (the speed) and the direction of travel. For example you might drive 100km/hr (the speed) in a northerly direction.This is analogous to the difference between distance (a scalar quantity) and displacement (the distance with direction.)
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Velocity is with direction and speed without direction
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