Figure shows a cube of side length 'a' p...

Figure shows a cube of side length `'a'` placed on a horizontal surface. A particle projected from `A` with speed `u`, at an angle `theta=tan^(-1)sqrt(5)` with horizontal, just touches the cube at two vertices as shown. Find projection speed `u`.

`sqrt(27/8 ag)`

`sqrt(2ag)`

`sqrt(3ag)`

`sqrt(8/3 ag)`

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