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 ....... $m/s$
AIEEE 2002, Easy
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(b)$v = \sqrt {2gh} = \sqrt {2 \times 10 \times 20} = 20\,m/s$
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