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You are standing at a crosswalk as you hear a frequency of 552 Hz from the siren of a police car approaching you. After

You are standing at a crosswalk as you hear a frequency of 552 Hz from the siren of a police car approaching you. After the police car passes you, the observed frequency of the siren decreases to 489 Hz. Determine the speed of the police car and the characteristic frequency of its siren if the speed of sound in air is 350 m/s. V 4 11 m/s Hz

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