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A man is walking at 1.1 m/s towards a racecar mounted loudspeaker. If the loudspeaker is emitting a 640 Hz tone and the man hears a 512 Hz tone, then what is the speed and direction of the car? Remember, both the man and the speaker are moving.
Source
Sound Waves – Doppler effect on moving observer
Thx bro! Helped a lot!