Question

Question #7a369

Answer 1

`(a). 2000"m"`

`(b). 6"s"`

Explanation:

The depth of the well is given by :

`s=1/2"g"t^2`

`=1/2xx10xx20^2`

`=2000"m"`

For the echo:

`t="dist/speed"=2000/330=6"s"`