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`        If a body covers first half of its journey with a uniform spees v1 and the second half of journey in a uniform speed v2 ;then the average speed of the body is  a]v1+v2                                    b]2v1 multiplied by v2 divided by                                                                       v1+v2  c]v1v2 divided by v1+v2           d]v1 multiplied by v2 The correct answer is the second option but i diddnt undsrstand hoe the 2 into v1 v2 came there`
10 months ago

## Answers : (1)

Arun
24475 Points
```							Avg speed=total distance covered/ total time takenSuppose the total distance=sTime taken for first half t1=distance/speed=(s/2)/v1=S/2v1Time taken for second half=s/2v2Total time=s/2v1)+(s/2v2)=s/2(1/v1+1/v2)=S(v1+v2)/2v1v2Avg speed= S/ total time takenBy solving this you getAvg speed=2v1v2/(v1+v2)
```
10 months ago
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