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18 A policeman on duty detects a drop of 10 in the pitch of the...

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18 A policeman on duty detects a drop of 10 in the pitch of the horn of motion of car as it crosses him velocity of sound is 330 m s Calculate the speed of the car 1 17 4 m s v 2 20 4 m s 3 18 6 m s 4 16 4 m s Whistle of frequency 640 Hz wher ency is

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