Physics - SHM Question with Solution | TestHub

In the figure, a spring-mass system is shown oscillating in uniform gravity. If we neglect all dissipative forces, it will continue to oscillate endlessly with constant amplitude and frequency. The accompanying graph shows how the displacement $x$ of the block from the equilibrium position varies with time $t$.

Now, at a certain instant $t=t_0$, when the block reaches its lowest position, gravity is switched off by some unknown mechanism. Which of the following graphs would correctly describe the changes taking place due to switching off the gravity?