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In this paper we consider the negative energy problem in generalized Vaidya spacetime. We consider several models where we have the naked singularity as a result of the gravitational collapse. In these models we investigate the geodesics for particles with negative energy when the II type of the matter field satisfies the equation of the state P=αρ (α∈[0,1]).doi:10.3390/universe6090155 doaj:835d5180db004e90a4a6c6fc5caf6c81 fatcat:uii72ft4nbfo5jprp42iplbhku