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a car moving at 30 m/s approaches a train going towards the car at 28 m/s. The train has a whistle that emits a steady

a car moving at 30 m/s approaches a train going towards the car at 28 m/s. The train has a whistle that emits a steady 220 Hz sound. what is the frequency of sound heard by the driver of the car? The speed of sound in air is 343 m/s.

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