A $4 \mathrm{~m}$ wide rectangular channel carries $6 \mathrm{~m}^{3} / \mathrm{s}$ of water. The Manning's ' $n$ ' of the open channel is 0.02 . Considering $g=9.81 \mathrm{~m} / \mathrm{s}^{2},$ the critical velocity of flow (in $\mathrm{m} / \mathrm{s},$ round off to two decimal places $)$ in the channel, is
A $4 \mathrm{~m}$ wide rectangular channel carries $6 \mathrm{~m}^{3} / \mathrm{s}$ of water. The Manning's ' $n$ ' of the open channel is 0.02 . Considering $g=9.81 \mathrm{~m} / \mathrm{s}^{2},$ the critical velocity of flow (in $\mathrm{m} / \mathrm{s},$ round off to two decimal places $)$ in the channel, is