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Question #7a369

1 Answer

Aug 9, 2015

#(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"#

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