As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 hz. after the car goes by, you hear a frequency of 65 hz. what is the speed of the car? the speed of sound in the air is 343 m/s.

26.8 m/s

Explanation:

 = constant speed of the car

 = speed of sound = 343 m/s

= actual frequency of the horn

= frequency heard as the car approach = 76 Hz

frequency heard as the car approach is given as

                              eq-1

= frequency heard as the car recedes = 65 Hz

frequency heard as the car goes away is given as

                                 eq-2

dividing eq-1 by eq-2

= 26.8 m/s

i think the answer is a, hope this is right, that would be my best guess.