So, I am supposed to answer this question for my class and I found some answers already. I would like someone to confirm them for me or if not, guide me into getting the right ones. This is physics introduction. The question: Suppose that a 0.20kg is oscillating at the end of spring upon a frictionless surface. The spring can be both stretched and compressed and has a spring constant of 240N/m. It was originally stretched a distance of 12cm from its equilibrium. 1) What´s its initial potential PEmax? My answer is 1.728 J. 2) Where is the oscillation maximum reached? My answer is equilibrium position. 3) What´s the maximum velocity that the mass will reach in its oscillation? My answer is 4.157 m/s.