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.

Figure shows a cube of side length 'a' placed on a horizontal surface.

1.	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.
Answer» `SQRT(27/8 AG)` `sqrt(2AG)` `sqrt(3ag)` `sqrt(8/3 ag)` ANSWER :C