Question

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

Answer 1

Displacement will be zero as starting and ending point coincides.

Distance travelled is 2×2π(2R)=8πR.

Thanks.
Tripathy

Answer 2

Distance covered = 2 × Circumference of circle
= 2 × (2πr)
= 2 × 2π × 2R
= 8πR

Displacement: Shortest distance between initial and final position.
After 2 complete rounds body is again at its initial position. Hence its displacement will be zero.