A particle is projected with a certain velocity at an angle \( \alpha \) above the horizontal fr...
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4A particle is projected with a certain velocity at an angle \( \alpha \) above the horizontal from the foot of an inclined plane of inclination \( 30^{\circ} \). If the particle strikes the plane
\( \mathrm{P} \) normally then \( \alpha \) is equal to
(A) \( 30^{\circ}+\tan ^{-1}\left(\frac{1}{2 \sqrt{3}}\right) \)
(B) \( 45^{\circ} \)
(C) \( 60^{\circ} \)
(D) \( 30^{\circ}+\tan ^{-1}(\sqrt{3} / 2) \)
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