Near the top of the Citigroup Center building in New York City, there is an object with mass of 4.00 × 105 kg on springs that have adjustable force constants. Its function is to dampen wind-driven oscillations of the building by oscillating at the same frequency as the building is being driven-the driving force is transferred to the object, which oscillates instead of the entire building.

(a) What effective force constant should the springs have to make the object oscillate with a period of 2.00 s?

(b) What energy is stored in the springs for a 2.00-m displacement from equilibrium?