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A projectile is projected at an angle \( \alpha\left(>45^{\circ}\right) \) with an initial velocity \( \mathrm{u} \). The time \( \mathrm{t} \) at which its horizontal component will equal the vertical component in magnitude:
(A) \( t=u / g(\cos \alpha-\sin \alpha) \)
(B) \( t=u / g(\cos \alpha+\sin \alpha) \)
(C) \( \mathrm{t}=\mathrm{u} / \mathrm{g}(\sin \alpha-\cos \alpha) \)
(D) \( t=u / g\left(\sin ^{2} \alpha-\cos ^{2} \alpha\right) \)
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