9. A 2.00-kg object is attached to a spring and placed on a frictionless, horizontal surface. A horizontal force of 20.0 N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis). The object is now released from rest from this stretched position,and it subsequently undergoes simple harmonic oscillations.Find
a)the force constant of the spring
b)the frequency of the oscillations
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