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A bullet from a gun is fired on a rectangular wooden block with velocity u . When bullet travels `24` cm through the block along its length horizontally, velocity of bullet becomes `u/3` . Then it same direction before coming to rest exactly at the other end of the block . The total length of the block is :

A

`24 cm`

B

`28cm`

C

`30 cm`

D

`27 cm`

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