A marble rolls down from top of a staircase with constant horizontal velocity \( u \). If each s....

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A marble rolls down from top of a staircase with constant horizontal velocity \( u \).
\( \mathrm{P} \)
If each step is \( y \) metre high and \( x \) metre wide, the marble just hits the edge of the nth step when \( n= \)
(1) \( \frac{x u^{2}}{g y^{2}} \)
(2) \( \frac{u^{2}}{g y} \)
(3) \( \frac{2 y u^{2}}{g x^{2}} \)
(4) \( \frac{4 y u^{2}}{g x^{2}} \)


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