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Los datos son:
vi = 45 km/h
vf = 120 km/h
t = 30 s
a = ?
Pasas las unidades al SI
vi = (45 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 12,5m/s
vf = (120 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 33,33 m/s
Calculamos la aceleración.
a = (vf - vi)/t
a = (33,33 m/s - 12,5 m/s)/30s
a = (20,83 m/s)/30s
a = 0,69 m/s²
Respuesta.
a = 0,69 m/s²