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Atrain moving at a constant speed is passing a stationary observer on a platform. on one of the train cars, a flute player is continually playing the note known as concert a (f = 440 hz). after the flute has passed, the observer hears the sound with a frequency of 415 hz. what is the speed of the train? the speed of sound in air is 343 m/s. a) 7.3 m/s b) 12 m/s c) 21 m/s d) 37 m/s e) 42 m/s
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