(90 + a) km/h 20 Mg 25 Mg A В Figure Q1 (a)

A car stops 4 seconds after the application of the brakes while covering a rectilinear stretch 337 feet long. If the motion occurred with a constant acceleration a, determine the initial speed of the car and the acceleration a. Express v in mile-per-hour (mph) and a in terms of g, the acceleration of gravity. S

A light train made up of two cars connected by a coupling is traveling at 80 km/h when the brakes are applied to both cars. 80 KPH A B Knowing that car A has a mass of 20,000 kilograms and car B a mass of 25,000 kilograms, and that the braking force is 20 kN on each car, determine: (a) the distance traveled by the train before it comes to a stop(in meters), (b) the force in the coupling between the cars while the car is slowing down(in kN)