Question

A body moves in a circle of radius 2R. What is the distance covered and displacement of the body after 2 complete rounds?

Answer 1

Again, in this motion the initial and final positions are same 

So, displacement t = final position – initial position = 0 

Here, radius of circle = 2r So, circumference = 2n x 2r = 4πr 

Now, since the body completes 2 rounds, so total distance travelled = 2 x circumference = 2 x 47πr = 8πr .