Question

define velocity . what is SI unit of velocity​

Answer 1

the speed of something in a given direction.

m/s

Answer 2

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 (m⋅s−1).