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The length of ballistic pendulum is 1 m ...

The length of ballistic pendulum is `1 m` and mass of its block is `0.98 kg`. A bullet of mass `20` gram strikes the block along horizontal direction and gets embedded in the block. If block + bullet completes vertical circle of radius `1m`, then the striking velocity of bullet is

A

`280 m//s`

B

`350 m//s`

C

`420 m//s`

D

`490 m//s`

Text Solution

Verified by Experts

The correct Answer is:
B
According to law of conservation of linear momentum `m u = (M+m)v`
`u=((M+m)sqrt(5gr))/(m)`.
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