A particle executes S.H.M. of amplitude A along x -axis. At t=0, the position of the particle is x=A/2 and it moves along positive x -axis. The…

A particle executes S.H.M. of amplitude A along $\displaystyle x$-axis. At $\displaystyle t=0$, the position of the particle is $\displaystyle x=\frac{A}{2}$ and it moves along positive $\displaystyle x$-axis. The displacement of particle in time $\displaystyle t$ is $\displaystyle x=A \sin (\omega t+\delta)$, then the value $\displaystyle \delta$ will be