1. The problem statement, all variables and given/known data A spring has a relaxed length of 5 cm and a stiﬀness of 95 N/m. How much work must you do to change its length from 2 cm to 10 cm? k=95 Lnull=0.05 delta x = .1-.02 = 0.08 2. Relevant equations F=-kx W=Fdcostheta 3. The attempt at a solution I honestly have tried everything and am beginning to think I am way off the mark and missed something. But what i tried was W = Fdcostheta where F = -kx Therefore, since force changes direction after the displacement is past the relaxed spring length, i used: W = -95 * (0.05-0.02) * (0.05-0.02) cos 0 + -95 * (0.1-0.5) * (0.1-0.5) cos 180 But that was apparently completely wrong. any help please?