A ball suspended by a thread swings in a...

A ball suspended by a thread swings in a vertical plane so that its acceleration in the extreme position and lowest position are equal. The angle  of thread deflection in the extreme position will be - 2

`tan^(-1)(B)`

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

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

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

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