# Question #103cf

1. Distance covered in one revolution $=$One circumference
$= 2 \pi r$. Inserting given value we get
Distance coverd in one revolution $= 2 \pi \times 5$.
$\therefore$ Distance moved in three revolutions $= 3 \times 2 \pi \times 5 \approx 94.2 c m$.
2. We know that displacement $\Delta \vec{r}$after one revolution$= 0$, as body moving in circular motion is back to its original location.
$\implies$ Displacement $\Delta \vec{r}$after three revolutions$= 0$