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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Mar 2008 16:49:16 IST
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distance travelled by balloon in first 5 sec = 1/2 * 3 * 25 = 75/2
vel of balloon after 5 sec = 3*5 = 15
let the balloon and stone meet (t + 5) sec after the balloon starts going up
h = ht at which they meet = 1/2gt^2
also, h1 = distance traveled by balloon from T=5sec till T=t+5
h1 = 15*t + 1/2*3*t^2
h - h1 = 75/2
solve for t and get hence get u from 0 = u - gt
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