After studying the motion of a ball rolling on a straight line as shown in figure:

Find its distance and displacement covered
(i) when it rolls from $\mathrm{P}$to $\mathrm{Q}$ and then to $\mathrm{R}$ (i.e. $\mathrm{P}$ to $\mathrm{Q}$ to $\mathrm{R}$) and
(ii) finally comes back to $\mathrm{P}$ (i.e. $\mathrm{P}$to $\mathrm{P}$) (take, $\mathrm{P}$as reference point).