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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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