Boxes A and B are in contact on a horizontal, frictionless surface as shown in the diagram below. Box A has a mass of 15.0 kg and box B has a mass of 10.0 kg. A horizontal force of 250 N is exerted on box A. 250 N A B Draw a clearly labeled free-body diagram for both box A and box B. What is the acceleration of the combined boxes? What is the magnitude of the force that box A exerts on box B? What is the magnitude of the force that box B exerts on box A