2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/124105An asymmetric object, undergoing dissipative collisions with surrounding particles, acquires a nonzero average velocity. The latter is calculated analytically by an expansion of the Boltzmann equation and the result is compared with Monte Carlo simulations.5 pages, 4 figures, submitted to EPLStatistical Mechanicstext