A ball rolls of the top of a stair way with a horizontal velocity 𝑒 ms βˆ’1 . If the steps are β„Ž 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 𝑒 ms βˆ’1 . If the steps are β„Ž 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}

Answer: option (B)

Solution:

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