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A stationary motion detector sends sound waves of frequency of 386 Hz toward an approaching vehicle. If the frequency of the waves reected back to

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A stationary motion detector sends sound waves of frequency of 386 Hz toward an approaching vehicle. If the frequency of the waves reected back to the detector is 720 Hz, what is the speed of the vehicle? (Take the speed of sound to be 343 m/s.) Express your answer in m/s, to at least one digit after the decimal point

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