Question

A particles is moving along a circular path of radius r. What will be the distance and displacement of the particles after one complete round of the path​

Answer 1

Explanation:

The displacement is the minimum distance between the initial position and final position. 

Suppose a particle starts at a point A at the periphery of the circle and after covering half the circle, particle is at point B. 

The minimum distance between points A and B is AB which is also the diameter of the circle.

Therefore, displacement after covering half the circle =Diameter=2r

Answer 2

Answer:

Where r is radius of circle. When particle covers half the circle, it is diametrically opposite to the starting point of its motion. Therefore shortest distance is equal to diameter of circle or 2× r is a displacement. Hence displacement is equal to diameter or 2 times the radius of circle.