. A ball rolls off top of a stairway with a horizontal velocity u m/s. If the steps are h m high and b meters wide, the ball will just hit the edge of t

Best Answer

If the ball hits the n step, the horizontal and vertical distances transvered are nb and nh respectively. Let t be the time taken by the ball for these horizonatal and vertical displacement. Then velocity along horizonatal direaction remain constant = u

initial velocity is zero 

nb=ut..........................(1)

n= 0+ (1/2) gt².................(2) 

From eq(1) and (2) we get by eliminating t,