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A ball is projected with velocity \( \mathrm{u} \) at right angle to the
\( \mathrm{P} \) slope which is inclined at an angle \( \alpha \) with the

W horizontal. The distance \( x \) along the inclined plane that it will travel before again striking the slope is -
(1) \( \frac{2 u^{2}}{g} \cos \alpha \)
(2) \( \frac{2 u^{2}}{g} \tan \alpha \)
(3) \( \frac{2 u^{2}}{g} \frac{\tan \alpha}{\cos \alpha} \)
(4) \( \frac{2 u^{2}}{g} \frac{\tan \alpha}{\sin \alpha} \)
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