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

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

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

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

`tan^(-1)sqrt2`

`tan^(-1)2`

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