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Question

A person completes half of his journey with speed v1 and rest half with speed v2. The average speed (vavg) of the person is


A
v1+v22
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B
2v1v2v1+v2
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C
v1v2v1+v2
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D
v1v2
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Solution

The correct option is C 2v1v2v1+v2
In this problem total distance is divided into two equal parts.

Let the total distance be d
Sovavg=d1+d2d1v1+d2v2=d2+d2d/2v1+d/2v2vav=21v1+1v2=2v1v2v1+v2

Physics

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