A train consists of 50 cars (including the engine), each of which has a mass of 6.8 * 10³ kg. The train has an acceleration of 0.05 m/s². Neglecting friction, determine the tension in the coupling.
a) 3.4 * 10³ N
b) 5.0 * 10³ N
c) 6.8 * 10³ N
d) 8.5 * 10³ N
