Which equation is not directly used to calculate any aspect of a parabolic trajectory?

F=ma is not directly used to calculate any aspect of a parabolic trajectory. This equation relates the force acting on an object (F) to its mass (m) and acceleration (a). In the case of a parabolic trajectory, the primary focus is on the object's motion and position, rather than the force causing that motion. The acceleration due to gravity is considered constant, and the other equations of motion are utilized to analyze and describe various aspects of the trajectory, such as maximum height, range, and flight time.