Question

define instantaneous speed and velocity​

Answer 1

Instantaneous velocity is defined as the rate of change of position for a time interval which is very small (almost zero). ... Instantaneous speed is the magnitude of the instantaneous velocity. It has the same value as that of instantaneous velocity but does not have any direction.......

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Answer 2

The instantaneous speed is the speed of an object at a particular moment in time. And if you include the direction with that speed, you get the instantaneous velocity. In other words, eight meters per second to the right was the instantaneously velocity of this person at that particular moment in time.