1. The problem statement, all variables and given/known data A buffer at the end of a rail track consists of a hydro-pneumatic shock absorber. The gas chamber of the absorber has an cylindrical geometry consisting of a length of 800mm and 0.5 m diameter and a pressure of 5 bar. Calculate the final pressure and stroke if a 2 tonne train hits the buffer at 5 m/s Answers: (408 mm, 8.12 bar) 2. Relevant equations PV^gamma=C 3. The attempt at a solution I've worked the initial volume to be 1.57m^3, but other than that I'm not sure how to go about the question. I'm assuming that the compression is adiabatic? Is this a correct assumption? Also how to I convert the momentum of the train into something I can use to calculate the answers? Thanks for any help!