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 80.0 hz. after the car goes by, you hear a frequency of 60.0 hz. what is the speed of the car? the speed of sound in the air is 343 m/s.

Speed of the car will be 49 m /sec

Explanation:

Speed of sound v = 343 m/sec

We have given that when car approaches he hears a sound of frequency 80 Hz

And when car go away from he hears a sound of frequency 60 Hz

So

And

So

u = 49 m/sec

explanation:

newton's third law, for every action there is an equal and opposite reaction.

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )