Ron has not used heroin for several days. He has a
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For an uniformly accelerated motion, the final velocity is given by:
where vi is the initial speed, a is the acceleration, and t the time interval.
In our problem,
, 
(with negative sign, because the car is decelerating), and 
. Substituting,
where vi is the initial speed, a is the acceleration, and t the time interval.
In our problem,