1. The problem statement, all variables and given/known data A locomotive (6.4 × 10^5 kg) is used to pull two railway cars (Figure 11). Railway car 1 (5.0 × 10^5 kg) is attached to railway car 2 (3.6 × 10^ kg) by a locking mechanism. A railway engineer tests the mechanism and estimates that it can only withstand 2.0 × 10^5 N of force. Determine the maximum acceleration of the train that does not break the locking mechanism. Explain your reasoning. Assume that friction is negligible. open the link and scroll to question 7 to see the diagram. http://www.lakeheadschools.ca/scvi_staff/childs/Gr11_physics_web/downloadable_content/unit3/textpdf3/phys11_3_5.pdf [Broken] 2. Relevant equations f = ma 3. The attempt at a solution the only force on car 2 is the tension of the locking mechanism, so Net force = 200kN 200kN / mass of the cart (360 000kg) = 0.55 m/s/s However the answer key says that the answer is 0.23 m/s/s which is the answer if we considered the divided 200kN by 860 000 kg. I believe that that would be the answer if calculating the maximum acceleration given the maximum tension between the locomotive and car 1 instead of car 1 and car 2. Or have I mistaken?