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Figure 3.21 shows the x - t plot of one-...

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 lt 0` and on a parabolic path for `t gt 0` ? If not, suggest a suitable physical context for this graph.

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It is not correct to say that the particle moves in a straight line for t`lt` 0 (i.e., -ve) and on a parabolic path for t`gt` 0 (i.e., +ve) because the x-t graph can not show the path of the particle.
For the graph, a suitable physical context can be the particle thrown from the top of a tower at the instant t = 0.
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