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A particle is projected horizontally with a speed of
\( \mathrm{P} \) \( \frac{20}{\sqrt{3}} \mathrm{~m} / \mathrm{s} \), from some height at \( \mathrm{t}=0 \). At what time will
\( \mathrm{W} \) its velocity make \( 60^{\circ} \) angle with the initial velocity
(1) \( 1 \mathrm{sec} \)
(2) \( 2 \mathrm{sec} \)
(3) \( 1.5 \mathrm{sec} \)
(4) \( 2.5 \mathrm{sec} \)
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