A pressure-pump has a horizontal tube of cross-sectional area $10\,cm ^{2}$ for the outflow of water at a speed of $20\,m / s$. The force exerted on the vertical wall just in front of the tube which stops water horizontally flowing out of the tube, is $...N$ [given : density of water $=1000\,kg / m ^{3}$ ]
JEE MAIN 2022, Medium
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$F =\rho av { }^{2}=10^{3} \times 10 \times 10^{-4} \times 20 \times 20$
$F =400$
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