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Los datos que tienes son:
vi = 0 m/s
vf = 90 km/h
t = 12 s
a = ?
d = ?
Pasas las unidades al SI
vf = (90 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 25 m/s
Calculamos la aceleración
a = (vf - vi)/t
a = (25 m/s - 0 m/s)/12s
a = (25 m/s)/12s
a = 2,08 m/s²------------Respuesta
Calculamos la distancia
d = (vf + vi)/2 * t
d = (25 m/s + 0 m/s)/2 * 12s
d = (25 m/s)/2 * 12s
d = 12,5 m * 12
d = 150 m---------Respuesta