Instantaneous velocity is the rate of change of an object's position at a specific moment in time. It is the speed and direction of an object at a particular instant.
Average velocity is the total displacement divided by the total time, while instantaneous velocity is the velocity at a specific point in time. Average velocity gives an overall picture of an object's motion, while instantaneous velocity provides information about an object's velocity at a specific moment.
Instantaneous velocity is calculated by taking the derivative of an object's position function with respect to time. It is the limit of average velocity as the time interval approaches zero.
The unit of measurement for instantaneous velocity is distance per unit of time, typically meters per second (m/s) in the International System of Units (SI).
Instantaneous velocity and acceleration are closely related, as acceleration is the rate of change of velocity over time. If an object's instantaneous velocity is increasing, its acceleration is positive. If its instantaneous velocity is decreasing, its acceleration is negative.