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Two train whistles have identical
frequencies of 1.77x10^2 Hz. When one
train is at rest in the station and the other
is moving nearby, a commuter standing
on the station platform hears beats with
a frequency of 6.00 beats/s when the
whistles operate together. What are the
two possible speeds that the moving
train can have?
(a) moving away from the station m/s
(b) moving towards the station m/s

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