A siren of a police car at rest emits at a predominant frequency of 1310 Hz. A frequency of 1390_Hz is heard when the police car is approaching an observer standing by a bus stop. a) What is the velocity of the police car in m/s? b) what will be the frequency heard by the person standing at the bus stop when the police car is moving away? and c) Report the velocity of the police car in miles per hour. 1 mile = 1.60934_km.
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