define speed and velocity and mention them
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Speed is the quantitative measure of how quickly something is moving. Velocity defines the direction of the movement of the body or the object. ... It can be defined as the distance covered by an object in unit time. Velocity can be defined as the displacement of the object in unit time.
SI unit: m/s
Common symbols: v, v, \vec
Other units: mph, ft/s
Dimension: LT−1
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Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s) or as the SI base unit of