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Two vehicles, each moving with speed u o...

Two vehicles, each moving with speed `u` on the same horizontal straight road, are approaching each other. Wind blows along the road with velocity `w`. One of these vehicles blows a whistle of frequency `f_1`. An observer in the other vehicle hears the frequency of the whistle to be `f_2`. The speed of sound in still air is `V`. The correct statement (s) is (are).

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