Look at the graphs (a) to (d) carefully and state, with reasons, which of these cannot possibly represent one-dimensional motion of a particle.

Explanation

(a) This graph does not represent one-dimensional motion because, a particle cannot have two different positions at the same time.
(b) This graph does not represent one-dimensional motion because a particle cannot have velocity in positive and negative direction at the same instant.
(c ) This graph also does not represent one-dimensional motion, because the speed is always positive in one-dimensional motion.
( c) This graph also does not represent one-dimensional motion, because the speed is always positive in one-dimensional motion.
(d) This graph also does not represent one-dimensional motion, because the total path length covered by a particle can never decrease with time.