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zoecelinee

Velocity is a vector quantity, which means that a body's speed and direction are both required to define it. They are different because: Speed is the rate of change of distance with time

but velocity is the rate of change of displacement with time.

AL2006

The main difference is that speed is a "scalar" quantity ... it only has size.

Velocity is a "vector" quantity ... it has size AND a direction.

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