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A bullet is fired normally towards an immovable wooden block. It loses 25% of its kinetic energy in penetrating through a thickness 'x' of the plank. The total thickness penetrated by the bullet into the block is :

$\begin {array} {1 1} (1)\;4x & \quad (2)\;6x \\ (3)\;8x & \quad (4)\;2x \end {array}$

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1 Answer

+1 vote
(1) 4x
answered Nov 7, 2013 by pady_1 1 flag

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