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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Apr 2008 12:52:32 IST
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since the process is elastic so the net kinetic energy lost shud be equal to the thermal energy gained rite?
so i think the anser is
1/2x10x10^2 +1/2x20x20^2 = 4500J
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