Question

11th physics, chapter-3, Figure 3.21 shows the x-t plot of one-dimensional motion of a particle. Is it correct to say from the graph that the particle moves in a straight line for t < 0 and on a parabolic path for t > 0? If not, suggest a suitable physical context for this graph.


(Fig 3.21)

Answer 1

concept :- As you know x - t doesn't represent the trajectory of the path followed by the particle .

solution :-
No, it's not correct to say from the graph that the particle moves in a straight line for t< 0 and on parabolic path for t>0 .

A suitable context :- A free falling particle under the gravity is suitable example of given graph.

Answer 2

Answer:

Position-time graph represents the position at any instant, not the trajectory of a particle.

For t<0, the position- time graph is time axis which signifies that the body is at rest.

For t>0, the position-time graph is parabola which signifies that the body starts moving with constant acceleration.

The suitable example for this type of graph is a free falling body held for sometime at a height.

Thanks