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We study the resistive transition in Josephson-junction arrays at $f=1/2$flux quantum per plaquette by dynamical simulations of theresistively-shunted-junction model. The current-voltage scaling and criticaldynamics of the phases are found to be well described by the same criticaltemperature and static exponents as for the chiral (vortex-lattice) transition.Although this behavior is consistent with a single transition scenario, wherephase and chiral variables order simultaneously, two different dynamicexponents result for phase coherence and chiral order.Comment: 4 pages, 3 figures, to appear in Europhysics Letter

Two dynamic exponents in the resistive transition of fully frustrated Josephson-junction arrays