AVERAGE SPEED AND AVERAGE VELOCITY

It's very unusual for something to travel at an exactly constant speed - it will probably change. Imagine that you are in a bus travelling along a motorway to London. Lets say that it is 300 km and that it takes 5 hours. This does not mean that it has been going at exactly 60 km/hour all the time. Sometimes it will have been going faster and sometimes slower.



However the AVERAGE speed of the bus will be 60 km/hr.



If you are in car that changes its speed STEADILY from one speed to another then:


The same also applies to the velocity. You can work out the average velocity of something in just the same way.

If you are in car that changes its velocity STEADILY from one velocity to another then: