Question

Solve this with proper steps.

The best answer with proper steps will be marked as the brainliest.​

Answer 1

Answer:

we know that,

s=ut+(1/2)at²

u=0,a=10,t=20.

s=(1/2)*10*20*20

s=2000.

so, height is 2000m

time to hear echo= time in which pebble reaches water+time in which sound reaches our ear.

=20+2000/330

=20+6.060606....

=26.606060..

which is approximately 26.1.