Average Speed

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Average Speed 

Ratio of Total Distance  to total time is called average Speed.
 Mathematically ,
                

Unit :

 the unit of average velocity is 


Problem: 

 A Racing car accelerate uniformly through 3 gear change with the following average speed:

  1.  30 ms-1 for 10 sec
  2. 40 ms-1 for 5 sec
  3. 60 ms-1 for 3 sec

Now what is overall average speed of car?

Solution : 

  1. Car cover 30 m distance in one second so total distance covered by the car in 10 sec is 30 x 10 = 300 m
  2. Car cover 40 m distance in on second so total distance covered  by the car in 5 sec is 40 x 5 = 200 m
  3. Car cover 60 m distance in one second so total distance covered by the car in 3 second is 60 x 3 = 180 m

So

Total distance covered by the car = 300+200+180

                                                      =680 m

Total time taken= 10+5+3= 18 sec



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