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Q.

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
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