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A highway patrol officer uses a device that measures the speed of vehicles by bouncing radar...

A highway patrol officer uses a device that measures the speed of vehicles by bouncing radar off them and measuring the Doppler shift. The outgoing radar has a frequency of 105 GHz and the returning echo has a frequency 18.0 kHz lower. What is the velocity of the vehicle? Note that there are two Doppler shifts in echoes. Be certain not to round off until the end of the problem, because the effect is small.

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