A bullet moving with a speed of \( 100 \mathrm{~ms}^{-1} \) can just penetrate two planks of equ...

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A bullet moving with a speed of \( 100 \mathrm{~ms}^{-1} \) can just penetrate two planks of equal thickness. Then the number of such planks penetrated by the same bullet when the speed is doubled will be
[KCET 2004]
(a) 4
(b) 8
(c) 6
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