Introduction to speed

Speed is the rate of motion or simply the rate of a certain distance travelled.
Speed can be calculated by the following formula:


when v=speed(velocity),x=distance travelled and t =time taken.

Uniform Speed:
Very easy,means the speed maintained the same!

Average Speed:
Lets look at an example,

Mr Tan drives from Town A to Town B one day.He travelled at a speed of 100km/h for 2 hrs and reduces his speed to 40km/h for another hr and finally reached Town B.What is his average speed?

Total hours taken:1+2=3(hrs)
Distance travelled :40+100+100=240(km)
Average speed:240/3 = 80(km)

From the following example,we could see that we can get average speed by using the following formula:

Total Distance Travelled
_________________

Total Time Taken

Hope you will understand the concept of speed better now:)