The top of a water tank is open to air and its water level is maintained. It is giving out $0.74\,m^3$ water per minute through a circular opening of $2\,cm$ radius in its wall. The depth of the centre of the opening from the level of water in the tank is close to........ $m$
A$6.0$
B$4.8$
C$9.6$
D$2.9$
JEE MAIN 2019, Medium
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B$4.8$
b $\frac{{dv}}{{dt}} = Av \Rightarrow \frac{{dv}}{{dt}} = A\sqrt {2gh} $
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