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by using v^2=u^2+2as
final velocity becomes u/n after passing through plank
let width of each plank be d , thus from here we can find the retardation a=(u^2)-(u^2/n^2) /2d
if N number of planks are placed, after passing through Nth plank the velocity of bullet becomes zero
putting v=0 and s=Nd
we get
N=(n^2)/(n^2-1)
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