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Los datos son:
vi = 20 km/h
vf = 80 km/h
t = 30 min
Pasas los minutos a horas
1 hora = 60 minutos
30/60 = 0,5 h
Calculamos la aceleración
a = (vf - vi)/t
a = (80 km/h - 20 km/h) / 0,5h
a = (60 km/h)/0,5
a = 120 km/h²
Respuesta
a = 120 km/h²