1. The problem statement, all variables and given/known data (a) If the length of the Achilles tendon increases 0.51 cm when the force exerted on it by the muscle increases from 3400 N to 5800 N, what is the "spring constant" of the tendon? 1Your answer is incorrect. (b) How much work is done by the muscle in stretching the tendon 0.51 cm as the force increases from 3400 N to 5800 N? 2. Relevant equations Fx=-kx k=f1/x1 3. The attempt at a solution I'm stuck on part a, I used k=f1/x1=(3400/0.51) to find the spring constant but got the wrong answer.