A car speeding down the highway honks its horn, which has a frequency 392 Hz, but a resting bystander hears the frequency 440 Hz. If the speed of sound in air is 343 m/s, how fast is the car moving

37.42 m/s

Explanation:

We know that apparent frequency, is given by

where f is the given frequency in this case 392, V is the speed of sound in air which is given as 343 and is the speed of car which is unknown, \bar f is given as 440 Hz

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a skateboard rolling across the street - apex