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

I would cut down velocity as something like v=v*0.9 Then i would have a velocity which is considered the stopped velocity. This way the object would come to rest eventually and not continue consuming resources as moving. so something like for(v=startingVelocity;v<1.0;v*=0.9) { x+=v; }