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Q.

If a car travels from the point A to B with a speed v1 and comes back from B to A with speed v2, then the average speed of the car in complete journey is:

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a

v1+v22v1v2 

b

v1+v22 

c

2v1v2v1+v2 

d

v1−v22 

answer is A.

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Detailed Solution

Question Image 

A car travels equal distance AB=BA

avg speed=total distancetotal time taken

=2st1+t2⇒2ssv1+sv2⇒2ss[1v1+1v2]

=2v1+v2v1v2=2v1v2v1+v2

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