At the maximum height of a body thrown vertically up

Velocity-time graph of a body thrown vertically up is

A body is thrown up with a speed u , at an angle of projection theta If the speed of the projectile becomes u/sqrt2 on reaching the maximum height , then the maximum vertical height attained by the projectile is

A body is thrown up with a speed u , at an angle of projection theta If the speed of the projectile becomes u/sqrt2 on reaching the maximum height , then the maximum vertical height attained by the projectile is

For a body thrown vertically up with an initial velocity u ,the maximum height reached by body from the ground is