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A body is projected horizontally from a top of tower with a velocity 20m/s.After what time the vertical component of velocity is four times the horizontal component of velocity? $(g=10 m/s^2)$

$\begin{array}{1 1} (A)\;16 \;sec \\ (B) \;8\;sec \\ (C)\;4\;sec\\ (D)\;2\;sec \end{array} $

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