Question

A runner running along a circle, runs the circle completely. What is his displacement? What distance has be run?

Answer 1

Here displacement is zero because the runner had reach his initial position. The distance covered will be the circumference of the circle.

Answer 2

The displacement will be zero.Suppose if he starts from a point 'x',and in order to complete the race he comes back again to the point 'x'.Like this he comes back again to the position he started from.TYherefore the displacement will be zero.....