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Average speed

Its very unusual for something to travel at an exactly constant speed - it will probably change as time goes by. Sometimes it will have been going faster and sometimes slower.

A useful quantity is the average speed.

Average speed = Total distance/Total timespaces Total distance = Average speed x Total time

If the speed changes STEADILY from one speed to another then:
Average speed= [Final speed Initial speed]/2
© Keith Gibbs 2009