Standing at a crosswalk, you hear a frequency of 560 Hz from the siren on an approaching police car. Afte?

Standing at a crosswalk, you hear a frequency of 560 Hz from the siren on an approaching police car. After the police car passes, the observed frequency of the siren is 480 Hz. Determine the car’s speed from these observations.

vr = 0
v = 330 m/s
vs is what we have to find out

560 = (330/(330-vs)) fo
480 = (330/(330 + vs)fo
divide the 2 equations
560/480 = (330+vs)/(330-vs)
7*330 – 7vs = 6*330 + 6vs
330 = 13 vs
vs = 330/13 = 25.38 m/s

Chevy Caprice Police Car

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