A 3.5000 kg metal disk (Disk A) slides on a frozen lake with an initial speed of 1.2500 m/s. A nearby cat that is surprisingly strong hits the disk, changing its speed (but not its direction) to 2.8500 m/s. A 0.7500 kg disk (Disk B) traveling in the opposite direction then has a headon collision with Disk A. After the collision, Disk A keeps moving in the same direction at a speed of 1.4500 m/s while Disk B changes direction and moves with a speed of 2.1500 m/s. The initial direction of Disk A is taken to be positive. The contact time between the cat's paw and Disk A is 0.6000 s. The collision between Disk A and Disk B lasts 0.4000 s. The magnitude of the average contact force of Disk B acting on Disk A during the collision is, in N and to three decimal places