2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/84797We consider a macroscopic body propagating in a one-dimensional resistive medium, consisting of an ideal gas at temperature $T$. For a whole family of collisions with varying degree of inelasticity, we find an exact expression for the effective force on the moving body as a function of the body's speed and the value of the restitution coefficient. At low and high speeds it reduces to the well-known Stoke's and Newton's law, respectively.10 pages, 2 figuresPhysics EducationGeneral Physicstext