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A bullet strikes a plank of thickness 5 ...

A bullet strikes a plank of thickness 5 cm with a velocity of 1000 m/s and emerges out with a velocity of 400 m/s, the average retardation of the bullet is

A

`-8.4 xx 10^6 m/s^2`

B

`8.4 xx 10^6 m/s^2`

C

`-60 xx 10^5 m/s^2`

D

`60 xx 10^5 m/s^2`

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TARGET PUBLICATION-Motion in a plane-Exercise
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