A hydraulic jump is formed in a $2 \mathrm{~m}$ wide rectangular channel which is horizontal and frictionless. The post-jump depth and velocity are $0.8 \mathrm{~m}$ and $1 \mathrm{~m} / \mathrm{s}$, respectively. The pre-jump velocity is $\mathrm{m} / \mathrm{s}$. (use $\left.g=10 \mathrm{~m} / \mathrm{s}^{2}\right)$

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A hydraulic jump is formed in a $2 \mathrm{~m}$ wide rectangular channel which is horizontal and frictionless. The post-jump depth and velocity are $0.8 \mathrm{~m}$ and $1 \mathrm{~m} / \mathrm{s}$, respectively. The pre-jump velocity is $\mathrm{m} / \mathrm{s}$. (use $\left.g=10 \mathrm{~m} / \mathrm{s}^{2}\right)$