1. The problem statement, all variables and given/known data A spring with spring constant of 29 N/m is stretched 0.21mfromits equilibrium position. How much work must be done to stretch it an additional 0.14 m? Answer in units of J. 2. Relevant equations W=-kx(x)/2 3. The attempt at a solution I solved it and got 0.4263 and it was wrong. does it need to be negative?