Neglecting the air resistance, the time of flight of a projectile is determined by

$U_{v e r t i c a l}$

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$U_{h o r i z o n t a l}$

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$U = U_{v e r t i c a l}^{2} + U_{h o r i z o n t a l}^{2}$

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$U = U (U_{v e r t i c a l}^{2} + U_{h o r i z o n t a l}^{2})^{\frac{1}{2}}$

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Solution

The correct option is A
$U_{v e r t i c a l}$

Time of flight = $\frac{2 u s i n θ}{g} = \frac{2 u_{y}}{g} = \frac{2 \times u_{v e r t i c a l}}{g}$

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v_{0} = 215.

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