The short
answer is that velocity is the speed with a direction, while speed does not have a
direction.
Speed is a scalar quantityit 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 quantitywhen 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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