A police car moving at 48 m/s passes a truck moving at 35 m/s in the same direction. If the frequency of the siren is 800 Hz relative to the police car, what is the frequency (in Hz) heard by an observer in the truck when police car is behind truck? What is the frequency (in Hz) heard by an observer in the truck when police car is ahead of truck? (The speed of sound in air is 343 m/s.)

A police car moving at 48 m/s passes a truck moving at 35 m/s in the same direction. If the frequency of the siren is 800 Hz relative to the police car, what is the frequency (in Hz) heard by an observer in the truck when police car is behind truck? What is the frequency (in Hz) heard by an observer in the truck when police car is ahead of truck? (The speed of sound in air is 343 m/s.)

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