$4\mathrm{.}1$ How does Newton's $1^{st}$ law apply to rotational motion? Provide example.

$4\mathrm{.}2$ A thick disk is released from rest on an inclined platform without slipping.

$4$

i$)$ the minimum ${}_s$ compatible with this motion,

ii$)$ the acc. of the center $G,$ after the disk has rolled $10m.$

iii$)$ the vel. of the center $G$ if the disk were to move $10m$ down a frictionless $30$ inclined.