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23-05-2018
Mathematics

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30-05-2018

[tex]v=\sqrt{64h}=\sqrt{64}\cdot\sqrt{h}=8\sqrt{h}[/tex]
[tex]\text{substitute the value of h=84 ft.}\\\\v=8\sqrt{84}\approx8\cdot9.165\approx73.32[/tex]
[tex]\boxed{Answer:\ B.\ 73.32\ ft/sec}[/tex]

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