A hosepipe directs a horizontal jet of water moving with velocity of $20\, m/s$ on a vertical wall. The cross-sectional area of jet is $10^{-3}\,m^2$. If density of water is $1000\, kg/m^3$, then force acting on wall is ........... $N$ [Assuming water comes to rest after striking wall]
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$F=P A V^{2}$
$=1000 \times 10^{-3} \times 20^{2}$
$=400 \mathrm{N}$
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