1. The problem statement, all variables and given/known data A train consists of of 50 cars, each of which has a mass of 6800 kg. The train's acceleration = 0.08 m/s(squared). Ignore friction and determine the tension in the coupling (a) between the 30th and 31st cars and (b) between the 49th and 50th cars. 2. Relevant equations Net Force = Tension = mass * acceleration 3. The attempt at a solution Used the equation above I came to: 16320 N for part (a) and 26656 N for part (b). My problem is, I'm thinking those answers are supposed to be divided by some amount since there are couplings between each car.