The variation of velocity of a particle executing SHM with time is shown in the figure. The velocity of the particle when a phase change of $\pi /6$ takes place from the instant it is at one of the extreme positions will be

The variation of velocity of a particle executing SHM with time is shown in the figure.the displacement of the particle from the mean position when there is phase change of π/6

The variation of velocity of a particle executing SHM with time is shown in the figure.The acceleration of the particle when there is a phase change of $\pi /6$

The variation of velocity of a particle executing SHM with time is shown in the figure.The maximum displacement and acceleration of the particle when there is a phase change of $\pi /6$  respectively are

A particle is free to move along the $X$-axis has potential energy given by $U\left(x\right)=k\left[1-e^{-x^2}\right]$ for $-\infty \le x\le +\infty$,  where $k$ is a positive constant of appropriate dimensions. Then:

Two particles move parallel to the $x$-axis about the origin with same amplitude '$a$’ and frequency $\omega$. At a certain instant, they are found at a distance $\raisebox{1ex}{$a$}\!\left/ \!\raisebox{-1ex}{$3$}\right.$ from the origin on opposite sides but their velocities are in the same direction. What is the phase difference between the two?