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31. An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle

31. An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 465 Hz when the train is approaching him and 441 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find? Answer +

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