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    $\begingroup$ I believe you misunderstood the question. It is asking why the car does not continue to decelerate after (in your graph) t=6. $\endgroup$
    – DreamConspiracy
    Commented Dec 5, 2018 at 13:04
  • $\begingroup$ @DreamConspiracy The question itself results from a misunderstanding that this answer clarifies. As the time approaches the end of the braking, the force applied in opposition goes down to 0, and there's nothing stored up, as in a spring (it's instead dissipated as heat+noise). Over no period within the 6s is sufficient force applied to the car to push it backward, b/c contrary to the original question itself, there is not a "net" negative force as the questioner understood it (some "net" of both the force being applied against the car's movement and the force of the car's momentum/time). $\endgroup$
    – Jacob C.
    Commented Dec 10, 2018 at 23:00