A small hole of area cross-section $2\mathrm{ }\mathrm{m}{\mathrm{m}}^2$ is present near the bottom of a fully filled open tank of height $2\mathrm{ }\mathrm{m}.$ Taking $g=10\mathrm{ }\mathrm{m} {\mathrm{s}}^{-2}$, the rate of flow of water through the open hole would be nearly