Water flows out of a pipe and hits a wall.
When the jet of water hits the wall, it has horizontal velocity v and cross-sectional area A.
The density of the water is $\rho $. The water does not rebound from the wall.
What is the force exerted on the wall by the water?

1 )
$\frac{{\rho v}}{A}$
2 )
$\frac{{\rho {v^2}}}{A}$
3 )
$\rho Av$
$\rho A{v^2}$
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