. 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

Explanation:

The equation of trajectory is given by

Here, y is the y-coordinate of the particle

X is the x-coordinate of the particle

is the angle of projection

u is the final velocity

G is the acceleration due to gravity

In the given case angle of projection is zero. So,

Final Answer:

Thus, option (C) is correct i.e. 2u2h/gb2.

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