Consider a spring-mass simple harmonic oscillator in one dimension. The mass of the particle is m kg and the spring constant is k Nm -1 . At a given instant, the extension of the spring is x -meter and the speed of the particle is v ms -1 . On the x-v plane, if the graph of v as a function of x is a circle, then the correct option is:

1. A. k= 1 m
2. B. k=m
3. C. k=m 2
4. D. k= m

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