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One end of ideal string tied up with fix...

One end of ideal string tied up with fixed suppot & other end is tied with a bob. The string is released from horizontal position. When string makes an angle of `theta` with vertically downward direction then the acceleration vector of bob is horizontal then `theta` is

A

`tan^(-1)(2)`

B

`tan^(-1)(1//2)`

C

`tan^(-1)(sqrt(3))`

D

`tan^(-1)(sqrt(2))`

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