A woman is sitting at a bus stop when an ambulance with a siren wailing at 430 Hz approaches at 31.0 m/s (about 69 mph). Assume the speed of sound to be 343 m/s. (a)
What frequency (in Hz) does the woman hear?
fa = Hz
With what speed vs (in m/s) would the ambulance have to travel in order for the woman to hear the siren at an apparent frequency of fa = 451 Hz?
vs = m/s

What frequency (in Hz) would the woman hear if the siren moved away from her with the same speed you found in part (b)?
fa = Hz

explanation:

could i give you a exaplo that could you?

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."