A stone is dropped into a 40m deep well. The sound of the splash is heard 2.95 seconds after the stone is dropped. Find the speed of sound.
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Let, $t$=time taken by the stone; $T$=Time taken by the sound(both are in second) $d$=depth of the well and $s$=velocity of the sound
Use the following equations:
$d=1/2 gt^2$ (For stone)
$d=sT$ (For sound)
Finally, put $d=40 m$, solve for $t$. Find out $T$ and hence $s$ i.e the speed of sound.