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[" (C) "352.4],[" A policeman on duty de...

[" (C) "352.4],[" A policeman on duty detects a drop of "10%" in the frequency of the horn of a motor car as it "],[" crosses him.If the velocity of sound is "330m/s" ,the so ".3m/sec" car is "],[[" (A) "20m/sec," (D) none of the above "],[(C)25m/sec," (D) none of the above "]]

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