The nozzle $\mathrm{AB}$, as shown below, leading to the test section of a low speed subsonic wind tunnel, has a contraction ratio of 10: 1 . The pressure difference across the nozzle is maintained at 1000 $\mathrm{N} / \mathrm{m}^{2}$ and the density of air is $1.23 \mathrm{~kg} / \mathrm{m}^{3}$. Assuming one-dimensional, steady, inviscid flow, the velocity in the test section as measured at point $\mathrm{B}$ is____________ $\mathrm{m} / \mathrm{s}$

The nozzle $\mathrm{AB}$, as shown below, leading to the test section of a low speed subsonic wind tunnel, has a contraction ratio of 10: 1 . The pressure difference across the nozzle is maintained at 1000 $\mathrm{N} / \mathrm{m}^{2}$ and the density of air is $1.23 \mathrm{~kg} / \mathrm{m}^{3}$. Assuming one-dimensional, steady, inviscid flow, the velocity in the test section as measured at point $\mathrm{B}$ is____________ $\mathrm{m} / \mathrm{s}$

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