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![[Post New]](/templates/default/images/icon_minipost_new.gif) 6 Apr 2008 18:24:53 IST
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pls explain how.
| A ball rolls off the top of a stairway with a horizontal velocity u ms-1. If the steps are h metre high and b metre broad, then the ball will just hit the edge of nth step when n is given by
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" From ashes a fire shall be woken From shadows a light shall spring " ---Tolkien
" Throughout the centuries there were men who took first steps down new roads armed with nothing but their own vision. " --- Ayn Rand
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6 Apr 2008 18:30:13 IST
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lets think it hits the nth sttep
height h'=nh
range = nb
range = u  2h'/g
nb = u 2nh/g
squaring both sides
n2 b2 = u2 2nh/g
nb2 =u2 2h/g
n = u2 2h /gb2
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this reply: 7 points
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