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Q.
Which of the following graphs cannot possibly represent one dimensional motion of a particle?
AMUAMU 2010Motion in a Straight Line
Solution:
$I$ does not represent the one dimensional motion because total distance covered by a particle increases and decreases with time. $II$ and $III$ do not represent the one dimensional motion because of a particular time position cannot have two values. $IV$ is not possible because speed can never be negative.