1. A guy us riding a tricycle at 33kg at 12m/s when it strikes a spring and is brought to rest in 1.6m. Compute the proportionality constant and explain the type of energy, types of forces, and Hookes law applied 2. F = k(elongation) I am sure there are others. 3. my problem comes from when I try and combine f=k(elongation) with f = ma, I dont have an acceleration part of the problem. I dont have time, so I dont know impulse either. I am sure it is solvable, but I just cant figure it out at the moment. Even if you just post the formulas I would need to do the calculations I would appreciate it.