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The frequency of the sound of a car horn...

The frequency of the sound of a car horn as perceived by an observer towards whom the car is moving differs from the fre-quency of the horn by ` 2.5 % ` . Assuming that the velocity of sound in air is 320 m . ` s^(-1)` , find the velocity (in m . ` s^(-1)`) of the car .

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