A stone is dropped in a well which is $19.6\,m$ deep. Echo sound is heard after $2.06\, sec$ (after dropping) then the velocity of sound is .... $m/sec$
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$t = \sqrt {\frac{{2h}}{g}} + \frac{h}{v} = \sqrt {\frac{{2 \times 19.6}}{{9.8}}} + \frac{{19.6}}{v} = 2.06$
$ \Rightarrow $ $v = 326.7$ $m/s$
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