Rate of change of displacement with respect to the time is called velocity.

The velocity \(\vec{v}\) of a particle is given by the following formula,

$$ \vec{v} = \frac{\vec{x}}{t}$$

where,

\(\vec{x}\) = displacement of a particle

t = time taken

Velocity is a vector quantity. SI unit of velocity is metre/second and its dimensional formula is [ M^{0}L ^{1}T^{-1} ].