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 $\frac{u}{3}$. Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is $........\,cm$
- [NEET 2023]
- A$30$
- B$27$
- C$24$
- D$28$
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- [JEE MAIN 2022]
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- [AIPMT 1997]
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- [JEE MAIN 2021]