Aperson hears the echo of his own voice from a distant hill after 2 seconds. how far away is the person from the hill, if the speed of sound is 330m/s ?

330 m

Explanation:

The speed of sound is defined as the distance traveled by the sound wave in a especific time :  

Where:  

is the speed of sound  

is half the time the sound wave travels since the person speaks, the sound wave hits the hill and then returns to the person again  as an echo

is the distance between the person and the hill

So, we have to find :

Finally:

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s