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A bullet of mass 10g moving horizontally...

A bullet of mass `10g` moving horizontally with a velocity of `400 ms^(-1)` strikes a wooden block of mass `2 kg` which is suspended by a light inextensible string of length `5m`. As a result, the center of gravity of the block is found to rise a vertical distance of `10cm` . The speed of the bullet after it emerges out hirizontally from the block will be

A

`160 ms^-1`

B

`100 ms^-1`

C

`80 ms^-1`

D

`120 s ^-1`

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