1. The problem statement, all variables and given/known data So this is the question I need to solve. I was told to directly integrate the bottom equation to solve for x(t). I can solve (1) by differentiating (1) to turn it into 2nd order difffeq (mx''=kx), but I think I'm not allowed to do that ... I have no idea how to solve (2) using direct integration. It looks like a difficult non-linear equation to solve to me. please help me T T 2. Relevant equations 3. The attempt at a solution I solved (1) by turning into mx''=kx, but I'm not allowed to do that.