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  4. If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbines, is (Take g = 9.8 m/s2)

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Q. If the water falls from a dam into a turbine wheel $19.6\, m$ below, then the velocity of water at the turbines, is (Take $g\, =\, 9.8\, m/s^2$)

AIIMSAIIMS 1998Work, Energy and Power

Solution:

As the water falls freely from a height $19.6\, m$, so the velocity of water at the turbine is
$v=\sqrt{2gh}=\sqrt{2\times9.8\times19.6}$
$=19.6\, m/s$