Ambulence with siren at 1138Hz passes a cyclist pedaling at 2.6m/s....how fast

Alli

New member
is the ambulence moving? An ambulance with a siren emitting a whine at 1138 Hz overtakes and passes a cyclist pedaling a bike at 2.6 m/s. After being passed, the cyclist hears a frequency of 1012 Hz. How fast is the ambulance moving?
 
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