Test tomorrow...please help!!!! 1. The problem statement, all variables and given/known data A student in a parked car honks the horn, which has a `proper' frequency of 310.00 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 342 Hz. Calculate the speed of the approaching vehicle. Use 340 m/s as the speed of sound in air. 2. Relevant equations 3. The attempt at a solution Fs = 310 Hz Fo = 342 Hz Vo = 0 m/s V = 340 m/s Vs = ? I know Vs = (Fs - Fo / Fs + Fo) * V if the object is going away from the observer but how I do calculate if the object is approaching the person?