A particle has been projected with a speed of \( 20 \mathrm{~m} \mathrm{~s}^{-1} \) at an angle ...

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A particle has been projected with a speed of \( 20 \mathrm{~m} \mathrm{~s}^{-1} \) at an angle of \( 30^{\circ} \) with the horizontal. The time taken when
\( \mathrm{P} \) the velocity vector becomes perpendicular to the initial

W velocity vector is
(1) \( 4 \mathrm{~s} \)
(2) \( 2 \mathrm{~s} \)
(3) \( 3 \mathrm{~s} \)
(4) Not possible in this case
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