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229. assignment (Doppler effect)

At rest a car horn sounds A (440Hz) the horn is sounded while the car is moving at a velocity v. A bicycle is moving in the same direction as the car, but with a velocity of v/3 and hears the horn with apparent frequency of 415Hz. the speed of sound in air is 345.

a) is the bicycle in front of or behind the car?

 b) what is the speed of the car? 

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