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![[Post New]](/templates/default/images/icon_minipost_new.gif) 12 Dec 2007 16:43:41 IST
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hey it's not asking 4 the equ. extension rather the max. extension. see when u leave this bolck when the spring is un extended then the bolck exerts sudden force on the spring which makes it go to n extension of mg/k then also moves ahead because at that instant the velocity of the block isnt zzero.
so to get the max. ext. u hve to apply energy balance to get the max. ext.
so applying the same u get ,
mgX=0.5kX^2
from here u get X=2mg/k
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