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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Mar 2008 09:34:37 IST
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You have to equate the total displ dear......
let time for which it moves in vel v1 = t
time for which it moves in vel for next half wid vel v2= t
so total time = 2t
hence equate displ
v . 2t = v1 . t + v2 . t
so v = (v1 + v2)/2
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