A ball rolls off the top of a staircase with a horizontal velocity u m s-1. If the steps are h meter high and w meter wide the ball will hit the edge of the nth step if:
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a
n=gw22hu2
b
n=2hu2gw2
c
n=2u2gw2h
d
n=2hw2u2g
answer is B.
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Detailed Solution
In vertical directionIn horizontal directionnw=uto⇒n=2hv2gw2