Final answer:
The launch angle of a projectile affects its range. The maximum range is obtained at an angle of 45° when neglecting air resistance, but for every other angle, there are two angles that give the same range. Taking air resistance into account, the maximum angle is approximately 38°.
Step-by-step explanation:
The launch angle of a projectile affects its range. For a fixed initial speed, the maximum range is obtained at an angle of 45° when neglecting air resistance. However, if air resistance is considered, the maximum angle is approximately 38°. It is interesting to note that for every initial angle except 45°, there are two angles that give the same range, with the sum of those angles being 90°.