Question

Question 1
A particle is moving in a circular path of radius r. The displacement after half a circle would be:
(a) $Zero$
(b) $\pi r$
(c) $2r$
(d) $2\pi r$

Answer 1

Given, radius of the circular path is 'r'.
Displacement is the shortest distance between the initial and final position of the particle.
Since the particle moves half a circle, the displacement = diameter of the circle = 2r