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OpenStudy (anonymous):
You are driving along a highway at 22.0 m/s when you hear the siren of an ambulance traveling in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2800 Hz, but when it is past you the frequency becomes 2140 Hz. What is the speed of the ambulance? The speed of sound in air is 345.0 m/s.
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