Suppose that a 200g mass (0.20kg) is oscillating at the end of a spring upon a horizontal surface that is essentially friction-free. The spring can be both stretched and compressed and have a spring constant of 240N/m. It was originally stretched a distance of 12cm (0.12m) from its equilibrium (un-stretched) position prior to release. Ignoring friction, what are the values of the potential energy, kinetic energy, and velocity of the mass, when the mass is 6cm from the equilibrium position?

Question

Suppose that a 200g mass (0.20kg) is oscillating at the end of a spring upon a horizontal surface that is essentially friction-free. The spring can be both stretched and compressed and have a spring constant of 240N/m. It was originally stretched a distance of 12cm (0.12m) from its equilibrium (un-stretched) position prior to release.  Ignoring friction, what are the values of the potential energy, kinetic energy, and velocity of the mass, when the mass is 6cm from the equilibrium position?