You need two Doppler shifts - one from the UFO to still air, the other from still air to the car. Unlike relativity, there is a "preferred" reference frame here (the air) so relative motion does not give the complete picture.
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"I am a great believer in luck,
and I find the harder I work
the more I have of it."
--Thomas Jefferson
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George Spagna
Department of Physics
Randolph-Macon College
P.O. Box 5005
Ashland, VA 23005-5505
phone: (804) 752-7344
FAX (804) 752-4724
e-mail: gspagna@rmc.edu http://www.rmc.edu