Question

a particle travelling in a circular path of radius r completes one -quarter of a revolution . what is the distance travelled and displacement ?

Answer 1

distance travelled=1/4 of perimeter
$distance = \frac{1}{4} 2\pi {r}^{}$
so distance travelled =πr/2

displacement=√r^2+r^2
=√2r^2
=√2r

here r is radius.