A ball rolls from the top of a stair way with a horizontal velocity $u\; m /s$ . If the steps are $h\; m$ high and $b\; m$ wide, the ball will hit the edge of the $n^{th}$ step, if $n=$
A ball rolls from the top of a stair way with a horizontal velocity $u\; m /s$ . If the steps are $h\; m$ high and $b\; m$ wide, the ball will hit the edge of the $n^{th}$ step, if $n=$
- A
$\frac{{h{u^2}}}{{g{b^2}}}$
- B
$\frac{{{u^2}8}}{{g{b^2}}}$
- C
$\frac{{2h{u^2}}}{{g{b^2}}}$
- D
$\frac{{2{u^2}g}}{{h{b^2}}}$
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