A small hole of area of cross-section 2`` mm^2`` is
present near the bottom of a fully filled open
tank of height 2 m. Taking g = 10 m/``s^2``, the rate
of flow of water through the open hole would
be nearly
(1) 12.6 × ``10^{-6} m^3/s``
(2) 8.9 × ``10^{-6} m^3/s``
(3) 2.23 × ``10^{-6} m^3/s``
(4) 6.4 × ``10^{-6} m^3/s``