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13 January, 15:57

On a dry road, a car with good tires may be able to brake with a constant deceleration of 4.87 m/s2. (a) How long does such a car, initially traveling at 23.1 m/s, take to stop? (b) How far does it travel in this time?

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  1. 13 January, 16:24
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    (a) : the car takes to stop 4.74 seconds.

    (b) : the car travels 54.78 meters in this time.

    Explanation:

    a = 4.87 m/s²

    Vi = 23.1 m/s

    Vf = Vi - a*t

    t = Vi/a

    t = 4.74 sec

    d = Vi*t - (a*t²) / 2

    d = 54.78m
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