A body of mass ' m ' is projected with a speed ' u ' making an angle of 45^° with the ground. The angular momentum of the body about the point of…

A body of mass ' $\displaystyle m$ ' is projected with a speed ' $\displaystyle u$ ' making an angle of $\displaystyle 45^{\circ}$ with the ground. The angular momentum of the body about the point of projection, at the highest point is expressed as $\displaystyle \frac{\sqrt{2} m u^3}{X g}$. The value of ' $\displaystyle X$ ' is $\displaystyle \_\_\_\_$.