Question

An obiect is moving in a circle of radius r. Calculate the distance and
displacement
a) When it completes half the circle
b) When it completes one full circle​

Answer 1

Distance
1. πr
2. 2πr


Displacement
1. 2r
2. 0

Answer 2

Here is your answer-

1◆ When object completes half circle it covers distance

$\pi \: r$

and displacement 2r.

2◆When covers full circle-

total distance will be

$2\pi \: r$

and displacement will be 0.