A particle is thrown at time \( t=0 \) with a velocity of \( 10 \mathrm{~m} \mathrm{~s}^{-1} \) ...

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A particle is thrown at time \( t=0 \) with a velocity of \( 10 \mathrm{~m} \mathrm{~s}^{-1} \) at an angle \( 60^{\circ} \) with the horizontal from a point on an inclined plane, making an angle of \( 30^{\circ} \) with the horizontal.
The time when the velocity of the projectile becomes parallel to the incline is
(1) \( \frac{2}{\sqrt{3}} \mathrm{~s} \)
(2) \( \frac{1}{\sqrt{3}} \mathrm{~s} \)
(3) \( \sqrt{3} \mathrm{~s} \)
(4) \( \frac{1}{2 \sqrt{3}} \mathrm{~s} \)
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