Velocity is defined as the rate of change of position with respect to time. Velocity is a vector quantity.

Velocity has both magnitude as well as direction. For example, 1 2 km/s towards east, 2 4 m/s towards London from Liverpool

Velocity can also be defined as rate of change of displacement.

Average Velocity

Choosing one dimensional motion as a starting point to understand

The constant velocity that would provide the same resultant displacement(Δx) as a variable velocity in the same time interval(Δt.

Mathematically,  \overline{v} = \frac{\Delta x}{\Delta t} .

The bar over the v indicates average.

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