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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
detailed solution
Correct option is C
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.∴nb=ut ......(i) nh=0+12gt2 ......(ii)From eqn. (i),t=nbu,∴nh=12gnbu2∴n=2hu2gb2Talk to our academic expert!
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