Phase space of SHM - energy conservation

2026 Re-NEET 1 question

1. 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: