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A small ball B of mass m is suspended wi...

A small ball `B` of mass `m` is suspended with light inelastic string of length `L` from a block `A` of same mass in which can move on smooth horizontal surface as shown in the figure. The ball is displaced by angle `theta` from equilibrium position and then released.
The displacement of centre of mass of `A + B` system till the string becomes vertical is

A

zero

B

`(L)/(2)(1-costheta)`

C

`(L)/(2)(1-sintheta)`

D

None of these

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