Sketch the nature of the position - time graph for the unidirectional motion of a particle, having a variable velocity.

Sketch the nature of the position - time graph for the unidirectional

1.	Sketch the nature of the position - time graph for the unidirectional motion of a particle, having a variable velocity.
Answer» Solution :The curved line OP in Fig. 1.44 indicates the NATURE of the graph. It is to be noted that the curve OP does not have a NEGATIVE gradient at any point on it. The negative gradient of a line LIKE AB means that, TIME is running backwards - it is physically meaningless. On the other hand the negative gradient of CD means that the particle is moving back then it would not be a unidirectional motion.