2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/136516Dynamic equations of non-relativistic mechanics are written in covariant-coordinate form in terms of relative velocities and accelerations with respect to an arbitrary reference frame. The notions of the non-relativistic reference frame, inertial force, free motion equation, and inertial frame are discussed.11 pagesMathematical PhysicsGeneral Relativity and Quantum Cosmologytext