Answer

– Quantum mechanics can be considered an ab initio framework because, in principle, the properties of a system can be calculated from fundamental postulates and physical constants, without introducing empirical parameters specific to the system.
-The motion of a body can be predicted using Newton’s laws, its mass, the forces acting upon it, and the initial conditions. Fundamentally, no specific experimental adjustment is required for the trajectory in question.
-Yes, in a similar sense. Classical electromagnetism can be formulated based Maxwell’s equations, together with the Lorentz force law.