Problem 2: Braking Train (10 points) A light train made of two cars travels at 45 MPH. Car A weighs 18 tons, and car B weighs 13 tons. When the brakes are applied, a constant braking force of 4300 lb, is applied to each car. Determine: (a) the time required for the train to stop after the brakes are applied, (b) the force in the coupling between the cars while the train is slowing down. 45 mi/h A 18 tons B 13 tons