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A bullet of mass 10 g moving horizontall...

A bullet of mass 10 g moving horizontally with a velocity of `400ms^(-1)` strikes a wooden block of mass 2kg which is suspended by a light inextensible string of length 5 m. 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 the block will be

A

`120 ms^(-1)`

B

`160 ms^(-1)`

C

`100 ms^(-1)`

D

`80 ms^(-1)`

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