38. A single conservative force acts on a particle that moves along an x axis. The particle has mass of 2.0 kg. The potentialenergyassociated with  F(x)is described by , where x is in meters. What is the value ofxwhereF(x)is equal to zero?
(A) -1.0 m
(B) 1.0 m
(C) 0.5 m
(D) -0.5 m
(E) 0 m