The net force exerted on a particle acts in the + x direction. Its magnitude increases linearly from zero at x = 0, to 24.0 N at x = 3.0m. It remains constant at 24.0 N from x = 3.0m to x =8.0m, and then decreases linearly to zero at x = 0 to x = 13.0m graphically by determining the area under the Fx vs x graph.