Question: A 200-g mass lying on a frictionless table is attached to a horizontal spring with a spring constant of 400 N/m. The spring is stretched

A 200-g mass lying on a frictionless table is attached to a horizontal spring with a spring constant of 400 N/m. The spring is stretched a distance of 40 cm (0.40 m).
a. What is the initial potential energy of the system?
b. What is the kinetic energy of the system when the mass returns to the equilibrium position after being released?

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