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Two objects are projected horizontally in opposite directions from the top of a tower with velocities \( u_{1} \)
\( \mathrm{P} \) and \( u_{2} \). The time when their velocity vector are

W perpendicular to each other is
(1) \( \frac{u_{1} u_{2}}{g} \)
(2) \( \sqrt{\frac{u_{1} u_{2}}{g^{2}}} \)
(3) \( \frac{u_{1} u_{2}}{2 g} \)
(4) \( \sqrt{\frac{u_{1} u_{2}}{2 g^{2}}} \)
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