Instantaneous Speed

Speedometer's reading

If you want to find out your instantaneous speed - just look at the speedometer right at that moment.

                              

                    Image 3.4 (a): Speedometer                            Image 3.4 (b): Speedometer

In scooter video activity, the scooter rider travelled only 6 km during the entire journey but we saw that the speedometer sometimes showed a speed of 5 km/hour, sometimes 20 km/hour and sometimes 40 km/hour and so on. 

So the speed at any given moment, say every second, is known as the instantaneous speed.

Instantaneous speed can change with every moment or second. ​

However, for an object moving with constant speed, the instantaneous speed and the average speed will be the same.