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If a particle starts its motion from x=-4m, then which one represents the a-t graph?

The first figure is the question figure, the second figure contains the answer, and the third one contains the other options. Question figure

OptionsWhy is this the right answer

Why is this the right answer why are these the wrong answers

Why are these the wrong answers?

Chris Godsil
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Aditya
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1 Answers1

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HINT: In your figure--the one that has the velocity graph that is the question, what is the slope of the graph, first for $t$ in the interval $(0,2)$, then for $t$ in the interval $(2,4)$.

HINT 2: The slope of a line segment from say $[0,2]$ is always a constant i.e., it is the same at $1/2$ as it is at $3/2$.

Mike
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  • +2 and -2. Thanks, although I am still not sure about the x=-4m. It’s probably irrelevant, but I had to make sure. – Aditya Aug 17 '19 at 16:25
  • As the particle's velocity from $t=4$ onward stays the same, the acceleration from $t=4$ onward is 0. – Mike Aug 17 '19 at 16:27