A projectile has minimum speed at the top of the trajectory.
The path of a projectile is it's trajectory.
The path of a projectile is called the trajectory.
A projectile's trajectory is the curve along which it moves through the air or space. When a projectile is fired on earth the simplest theory holds that its trajectory will be parabolic in form. However, this does not account for air resistance and other factors.
A catapult's trajectory is the path that your projectile takes as it flies through the air.
A trajectory is the angle made with the horizontal when a projectile is fired. Suppose the projectile is a cannon ball. Assuming air is frictionless, that cannon ball will travel the greatest distance if the trajectory is 45 degrees from horizontal.
That is often referred to as a trajectory.
A ballistic trajectory