This is the question: At an airport, luggage is unloaded from a plane into the three cars of a luggage carrier. The acceleration of the carrier is .12 m/s2, and friction is negligible. The coupling bars have negligible mass. By how much would the tension in each of the coupling bars A, B, and C change if 39 kg of luggage were removed from car 2 and placed in (a) car 1 and (b) car 3? If the tension changes, specifiy whether it increases or decreases. In setting the problem up, do you calculate say, Tension A with the mg of Car 1, Tension B with the mg of Car 2, etc. and then add those totals OR do you add all the x-components of the tensions and then all the y-components?