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The velocity of a bullet is reduced from...

The velocity of a bullet is reduced from `200 m//s` to `100 m//s` while travelling through a wooden block of thickness `10 cm`. The retardation, assuming it to be uniform, will be.

A

`10xx10^4ms^-2`.

B

`12xx10^4ms^-2`.

C

`13.5xx10^4ms^-2`.

D

`15xx10^4ms2`.

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