A light train made up of two cars is traveling at 55 mi/h when the brakes are applied to b...

A light train made up of two cars is traveling at 55 mi/h when the brakes are applied to both cars. Knowing that car A has a weight of 55,000 lb and car B has a weight of 44,000 lb and that the braking force is 7000 lb on each car, determine (a) the distance traveled by the train before it comes to a stop, (b) the force in the coupling between the cars while the train is slowing down.