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a baloon moves vertically such stone is projected with horiz velocity u relative 2 baloon the stone always hits a river at a fixed distance 2u^2/g horiz away frm it find height of balloon as func of time
assume ballon hz. velocity be 0
so stone hz vel. is u
let t be time taken to hit river
s = u*t so, t = s/u = 2u2/gu
height of ballon = h = 0*t - 1/2*g*t2
= -1/2*g*(4u4/u2*g2)
h = - 2u2/g
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regards
Ramesh
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