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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Apr 2008 10:24:58 IST
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see cos37=h/L=4/5 L=elongated length
h/L=4/5
let x be the extension in spring
hence, L=h+x
5h=4h+4x
x=h/4
also loss in pe=gain in ke
1/2(kx^2)=1/2(mv^2)
v^2=kh^2/16m
v=h/4 root(k/m)
hope u get it
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