Question

a body is moving in a circular path of diameter is R completed 2 and half revolution the distance and displacement of body are

Answer 1

Displacement is the shortest distance between the final and the initial points.
So on completing 2 and half revolution the shortest distance between the final and the initial points is the diameter of the circle
Displacement =R
radius =R/2=r
Now distance=
$2 \times (2 \times \pi \times r) + (2 \times \pi \times r) \div 2$
=
$4 \times \pi \times r + \pi \times r$
=
$5 \times \pi \times r$