An open tankis filled with waterto a height of 20m. Whatis the velocity of the water flow at the outlet, if the outlet is at the base of the tank?

A

40 $$\frac{m}{s}$$ (approx.)

B

20 $$\frac{m}{s}$$ (approx.)

C

10 $$\frac{m}{s}$$ (approx.)

D

5 $$\frac{m}{s}$$ (approx.)