A train consists of 50 cars, each of which has a mass of 6.8 103 kg.

Question:

A train consists of 50 cars, each of which has a mass of 6.8 × 103 kg. The train has an acceleration of +8.0 × 10-2 m/s2. Ignore friction and determine the tension in the coupling
(a) Between the 30th and 31st cars and
(b) Between the 49th and 50th cars?