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30km/h ----> 8.33m/s (vf)
t=3s
Aceleración
a=(vf-vi)/t ---> ((8.55-22.22)m/s)/3s=-4.63m/s^2 (está desacelerando)
Tiempo que tarda en detenerse (vf=0)
vf=vi+a*t ----> 0=vi+a*t ---> -vi/a=t ----> t= -(22.22m/s)/-4.63=4.79s
Distancia hasta llegar al reposo (vf=0)
x=vi*t+(a*t^2)/2 ---> 22.22m/s*4,79s+(-4.63m/s^2*22.94s^2)/2
x=53.32m