# A ball rolls of the top of a stair way with a horizontal velocity 𝑢 ms −1 . If the steps are ℎ metre and 𝑏 metre wide, the ball hits the edge of 𝑛th step, the time taken by the ball is

Question: A ball rolls of the top of a stair way with a horizontal velocity 𝑢 ms −1 . If the steps are ℎ metre and 𝑏 metre wide, the ball hits the edge of 𝑛th step, the time taken by the ball is

(A) $\dfrac{hu}{gb}$

(B) $\dfrac{2hu}{gb}$

(C) $\dfrac{2hu^{2}}{gb}$

(D) $\dfrac{hu^{2}}{2gb}$