Question

what is instantaneous velocity ?how it helps a person in moving

Answer 1

Instantaneous velocity is the velocity at a specific instant in time. This can be different to the average velocity if the velocity isn't constant.
By the help of this instantaneous velocity a person can know his velocity and according to the situation he can either go fast or go slow

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Answer 2

Answer:

The quantity that tells us how fast an object is moving anywhere along its path is the instantaneous velocity, usually called simply velocity. It is the average velocity between two points on the path in the limit that the time (and therefore the displacement) between the two points approaches zero.