Water emerges from a pipe and strikes a wall. As the water jet reaches the wall, its horizontal speed is $v$ and its cross-sectional area is $A$. The density of the water is $\rho$. The water does not rebound from the wall. What force does the water exert on the wall?
- A$\frac{\rho v}{A}$
- B$\frac{\rho v^2}{A}$
- C$\rho A v$
- D$\rho A v^2$