Question

A stationary observer hears a sound with a frequency of 450 Hz from an approaching car. If the car emits the sound at a frequency of 360 Hz, what would be the speed of the car? (Speed of sound 340 m/s)
using doppler equation:f2=f1[Vw/(Vw-Vs)] where f2=450hz f1=360hz Vw=340m/s Vs=? 450=360(340/340-vs) 1.25(340-vs)=340 340-vs=272 vs=68m/s

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