As the car comes to rest it’s final velocity v will be 0
So our information g is
u = 12 m /s
t = 20s
v = 0
So acceleration is v-u/t
So 0-12/20
= -12/20
= -0.6 m / s^2
S= ut + 1/2 at^2
S = 12 x 20 + 1/2 x -12/20 x 400
S= 240 - 120
S = 120
It travels 120 m during the time interval.
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