Answer :

(a) A particle cannot have two positions at the same instant of time in on-dimensional motion. So, it is not one-dimensional motion.


(b) A particle in one dimensional motion never have two velocities at same instant of time. So, it is not one-dimensional motion.


(c) Speed is a scalar quantity so, it cannot be negative. It is not a one-dimensional motion.


(d) Total path length cannot be decrease. So, it is not representing any motion.


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