A water barrel stands on a table of height h. If a small hole is punched in the side of the barrel at its base, it is found that the resultant stream of water strikes the ground at a horizontal distance R from the barrel. The height of water in the barrel is
1
\(\frac{R}{2}\)
2
\(\frac{R^2}{4h}\)
3
\(\frac{R^2}{h}\)
4
\(\frac{h}{2}\)