Question

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

Answer 1

Hey dear,

# Answers -
Let's get to it one by one.

a) No.
Because the particle has two different positions at the same instant which is impossible in one dimensional motion.

b) No.
Because at the same instant a particle cannot have positive and negative velocity if the one dimensional motion.

c) No.
Because speed cannot be negative in any motion.

d) No.
Because here the total path length is shown to decrease with time which is not possible in one dimensional motion.

Hope that helps you...

Answer 2

None of the Graph represent one dimensional motion.

Reason :

a) In this case particle is having  two positions at a given instant of time which is not possible in one dimension

b) In this case,  particle is having negative and positive velocity which is not possible in one dimensional motion.

c) In this case , particle has positive and negative speed which is not possible in one dimensional motion.

d) In this case, particle is covering a total path which is in decreasing… But total path  length of moving particle can never  decrease with time.