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A train is moving on a straight track with speed 20 ms It is blowing...

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A train is moving on a straight track with speed 20 ms It is blowing its whistle at the frequency of 1000 Hz The percentage change in the frequency heard by a person standing near the track as the train passes him is speed of sound 320 ms close to a 6 c 18 b 12 d 24 JEE Main 2015 th 20 m is suspended from a rigid

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