Question: A train traveling at 2 8 m / s approaches a person on the platform. After passing the person, the engineer blows the train's whistle

A train traveling at 28 m/s approaches a person on the platform. After passing the person, the engineer blows the train's whistle at 1,115 Hz. What frequency in Hz does the person on the platform hear? The speed of sound is 345 m/s.

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