A ball rolls off the top of a staircase with a horizontal velocity u m/s. If the steps are h metre high and b metre wide, the ball will hit the edge of the nth step, if
If the ball hits the nth step, then horizontal distance traversed = nb.
Vertical distance traversed = nh.
Here, velocity along horizontal direction = u.
Velocity along vertical direction = 0.
From eqn. (i),