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A bullet of mass 10 gm moving with a vel...

A bullet of mass 10 gm moving with a velocity .u. penetrates 4 cm in to a target before coming to rest. If the average resistance offered by the target is 200 N, the value of .u. is

A

`20 ms^(-1)`

B

`40 ms^(-1)`

C

`60ms^(-1)`

D

`80 ms^(-1)`

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Verified by Experts

The correct Answer is:
B
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