2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95317We study the energy problem in the $R0X$ spacetimes in 5D. We found that for the Einstein, Landau-Lifschitz and the Moller complexes are null.General Relativity and Quantum CosmologyNull energy in plane Kaluza-Klein worldstext