A cylinder of height $ 20\; m$  is completely filled with water. The velocity of efflux of water (in $ m/s$) through a small hole on the side wall of the cylinder near its bottom is ....... $m/s$
  • A$10$ 
  • B$ 20$
  • C$25.5$ 
  • D$5$ 
AIEEE 2002, Easy
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