1. The problem statement, all variables and given/known data A train of total mass 1.02x10^5 kg strikes a buffer that behaves like a spring of stiffness 320kN/m with an initial velocity of 0.15m/s Calculate the maximum compression of the spring. 2. Relevant equations P=mv 3. The attempt at a solution P=mv = 15300kgm/s Units of spring stiffness so assumed Stiffness = F/d P=Ft F=P/t so S=P/dt, v=d/t t=d/v so, S=Pv/d^2 d^2=Pv/s d=sqrt (pv/s) final solution: sqrt ((1.53x10^4 * 0.15) / 320x10^3) = 0.0847m compression. Comments: Unsure of the real answer, and this method is totally invented. - Nor does it appear to take into account the changing force with respect to distance. - Is there a simpler method I have not taken into account? - This much assumption seems very off compared to the rest of the A2 syllabus Thanks, Vanagib.