The diagram (figure) shows a venturimeter, through which water is flowing. The speed of water at $X$ is $2\,cm/s.$ The speed of water at $Y$ (taking $g = 1000 \,cm/s^2$ ) is ........ $cm/s$
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$V_2^2 = V_1^2+2gh=(2)^2 + 2 \times 1000 \times 5.1 \times 10^{-1}=1024$
$V_2 = 32\,cm/s$
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