Aphysics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and simultaneously shouts . when she has fallen for 3.0 s , she hears the echo of her shout from the valley floor below. the speed of sound is 340 m/s.

Explanation:

When teacher falls into the cliff then she shout for Help at the same time

so here we know that sound will go down and reflect back up

so here in 3 s distance traveled by the sound

now in the same time the distance that teacher will fall down is given as

now total distance traveled by teacher and sound in 3 s

this total distance must be equal to twice the height of the cliff

as technology advances, new experiments often expose problems in accepted theories. c

hope i

-lavira: )

f is prop to m1xm2 double m1 double force