http://img208.imageshack.us/img208/2708/workingzl.jpg
Unfortunately that isn't correct but that is most likely just me doing it wrong. Thanks so much for the help 256bits, you explained it perfectly and is much more logical in comparison to my attempt :)
In order to measure the energy of projectiles, a test facility consisting of a horizontal insulated tube, closed at one end and with a frictionless piston of mass 1.5 kg at the other is used. The tube has a cross sectional area of 0.05 m2 and contains 1.15 kg of air at 20 °C and 100 kPa. During...