873 Boomo, the human cannonball, allows himself to be shot with a muzzle velocity, V, from a cannon inclined at an angle $\theta$ to the horizontal.
When he is moving horizontally (point A), he grabs trapeze T, of length 2 meters, and swings up to point B on the platform, where the trapeze is horizontal. Point B is at a horizontal distance x and vertical distance 20 meters from the mouth of the cannon.
In order to make the ace more dramatic, Boomo makes sure that the muzzle velocity is just great enough so that he just reaches point B and does not go above it. Find V, $\theta$, and x.