A body is moving along a circular path of radius R. What will be the distance travelled and displacement of the body when it completes half a revolution?
Which of the following can sometimes be 'zero' for a moving body ?
(i)average velocity
(ii) distance travelled
(iii) average speed
(iv) displacement
(a) only (i) (b) (i) and (ii) (c) (i) and (iv) (d) only (iv)