Final answer:
The optimal launch angle for a projectile to achieve maximum range on level ground is 45 degrees. This angle provides equal horizontal and vertical velocity components, maximizing distance. In aviation, specifics of approach angles depend on various factors and aren't directly analogous to simple projectile motion.
Step-by-step explanation:
The maximum intercept angle for an aircraft that is more than 2 miles from the approach gate is not provided among the options you've given. However, I can address a related topic within the realm of physics regarding the optimal angle for projectile motion. According to physics, the optimum angle at which a projectile should be launched in order to cover the maximum distance on level ground is 45 degrees. This principle applies due to the symmetrical properties of a projectile's trajectory when air resistance is negligible. At 45 degrees, the horizontal and vertical components of the initial velocity are equal, which results in the maximum range.
For projectiles, any launch angle above 90 degrees would not make sense, as it would direct the projectile backward. It's also important to note that a projectile's range is equal to zero at launch angles of 0 degrees or 90 degrees, as these angles represent horizontal and vertical launches, respectively.