how to calculate a negative acceleration?

Question

I\'m implementing the scrolling behaviour of a touch screen UI but I\'m too tired in the moment to wrap my mind around some supposedly trivial piece of math:

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Answer 1

A non-linear change in velocity means that acceleration is not constant. A non-constant acceleration means that the system is under the influence of jerk. Take all your acceleration equations and add "(1/6)jt³". Fix a, and give j a small negative value until v hits 0.