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A bullet of mass 20 g and moving with 60...

A bullet of mass `20 g` and moving with `600 m/s` collides with a block of mass `4 kg` hanging with the string. What is the velocity of bullet when it comes out of block, if block rises to height `0.2 m` after collision?

A

`200 m//s`

B

`150 m//s`

C

`400 m//s`

D

`300 m//s`

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