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A police van is chasing a thief s car on a straight highway with speed...

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A police van is chasing a thief s car on a straight highway with speed of van and car are 20 m s and 10 m s respectively If van is blowing horn of frequency 620 Hz then frequency heard by thief will be assume velocity of sound in air 330 m s 660 Hz X600 Hz 700 Hz 640 Hz

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