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

Question

If the water falls from a dam into a turbine wheel $19.6 \mathrm{~m}$ below, then the velocity of water at the turbines, is (Take $g=9.8 \mathrm{~m} / \mathrm{s}^2$ ), $9.8 \mathrm{~m} / \mathrm{s}$, $19.6 \mathrm{~m} / \mathrm{s}$, $39.2 \mathrm{~m} / \mathrm{s}$, $98.0 \mathrm{~m} / \mathrm{s}$

MARKS App · Accepted Answer

$v=\sqrt{2 g h}=\sqrt{2 \times 9.8 \times 19.6}=19.6 \mathrm{~m} / \mathrm{s}$.

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