Look at the graphs (a) to (d) (Fig. 3.20) carefully and state, with reasons, which of these cannot possibly represent onedimensional motion of a particle.

Explanation

Here, none of the graphs dosen.t represent the direction of motion in one dimension.
(a) Two positions are there at same time. Hence, it is not for motion in one dimension.
(b) There are positive and negative values of velocity for same time. It is not possible for motion in one dimension.
(c) Negative value of speed is not possible because it is always positive. Hence it is not for motion in one dimension.
(d) Path length cannot decrease with respect to time during motion. Hence, it is also not for motion in one dimension. Note that the directions of arrows in graph are meaningless.