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40. Multiple choice question XXXX

The velocity of a bullet is reduced from \(200\ ms^{-1}\) to \(100\ ms^{-1}\) while travelling through a wooden block of thickness \(10\ cm\). The retardation, assuming it to be uniform, will be

\(10 \times 10^4\ ms^{-2}\)
\(12 \times 10^4\ ms^{-2}\)
\(13.5 \times 10^4\ ms^{-2}\)
\(15 \times 10^4\ ms^{-2}\)

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