Question

what difference between instantaneous velocity and average velocity

Answer 1

Instantaneous velocity is the velocity of any body art an instant but Average velocity is the mean of instantaneous Velocity.
Instantaneouz Velocity is accurate.
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Answer 2

There are some cases when the average velocity and instantaneous velocity of an object will be the same. ... Whenever an object has a constant velocity, the average velocity will be the same as the instantaneous velocity. An example of this is a car driving down the highway at a constant speed of 60 miles per hour.