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physics

A body covers half the distance with a speed of 20 m/s and the other half with a speed of 30 m/s. The average velocity of the body during the whole journey is :

A

Zero

B

24

C

25

D

None of these

Answer

Correct option is
B

24

Let the total distance be .
For first half distance :
Speed  is
Thus time taken  
For second half distance :
Speed  is
Thus time taken  
Average velocity  

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