Actually Arithmetic- Speed

Speed is the rate of motion, or equivalently the rate of change of distance.Speed is a scalar quantity with dimensions length/time; the equivalent vector quantity to speed is velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity.



Types of Speed:

1. meters per second, (symbol ms-1; m/s)
   


2. kilometers per hour, (symbol km/h)
   


3. miles per hour, (symbol mph)
   


4. knots (nautical miles per hour, symbol kt)
   


5. Mach number, speed divided by the speed of sound
   


6. speed of light in vacuum (symbol c) is one of the natural units

What Is Average speed?

It is simply put into a formula:

Let r = average speed

Let D = total distance

Let t = total time

Here's your formula:

r = D/t

An example:

John wants to travel from City A to City B which is 900 Kilometres away from each other. He drives at a constant speed of 100 kilometres per hour. How long does he need to travel from City A to City B if he does stops and rest for 2 hours??

Answer= 11 hours

Solution= 900 km/hr divided by 100km/hr

= 9 hours

9 hrs + 2 hrs

=11hrs

Acknowledgements:

http://en.wikipedia.org/wiki/Speed

http://www.askmehelpdesk.com/middle-school/formula-average-speed-134278.html