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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 2kg which is suspended by a light inextensible string of length 5m .As a result , the centre of gravity of the block is found to rise a vertical distance of 10 cm . The speed of the bullet after it emerges out horizontally from thr block will be

A

`120ms^-1`

B

`160ms^-1`

C

`100ms^-1`

D

`80ms^-1`

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