Two forces are the only forces acting on a 3.0-kg object which moves with an acceleration of 3.0 m/s in the positive y direction.

Two forces are the only forces acting on a 3.0-kg object which moves with an accelerationof 3.0 m/s in the positive y direction. If one of the forces acts in the positive x directionand has a magnitude of 8.0 N, what is the magnitude of the other force?