Answer to Question #12914 in Mechanics | Relativity for marnie
t = 14m/((12m/s)/2) = 2.(3)s,
and so deceleration needed is
a = (12m/s) / 2.(3)s ≈ 5.1429 m/s².
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the distance S = 14 m equals time (unknown) multiplied by average velocity. In our case average velocity is (0 + 12 m/s)/2 = 6 m/s. Thus division by two appears here.
why do you have to divide it with two?