A cylinder of height 20m is completely filled with water. The velocity of effux of water `(in ms^(-1))` through a small hole on the side wall of the cylinder near its bottom is

Options

A. 10 m/s
B. 20 m/s
C. 25.5 m/s
D. 5 m/s

Answer

B

Explanation

`P.E.=K.E.`
`mgh =1/2 mv ^(2)`
`v = sqrt (2gh ) = sqrt (2 xx 10 xx 20) ` (Here `g= 10 m//s ^(2))=20 m//s`