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A bullet moving at 20m/sec. It strikes a...

A bullet moving at 20m/sec. It strikes a wooden plank and penetrates 4 cm before coming to stop. The time taken to stop is

A

0.008 sec

B

0.016 sec

C

0.004 sec

D

0.002 sec

Text Solution

Verified by Experts

The correct Answer is:
C
`v^(2) - u^(2) = 2as, t = (v-u)/(a), s = ((u + v)/(2))t`
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