It is defined as the speed or velocity at any instant or particular time….

Instantaneous velocity is defined as the rate of change of position for a time interval which is very small (almost zero). We know that the average velocity for a given time interval is total displacement divided by total time.It is vector quantity.Velocity (v) = ds/dtInstantaneous Speed : the average speed is for a given time interval is total distance travelled divided by the total time taken, we can also say that instantaneous speed at any given time is the magnitude of instantaneous velocity at that time.It is scalar quantity.Speed(s) = ds/dt