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Los datos que tienes son:
vi = 0 m/s
vf = 1080 km/h
a = 25 m/s²
t = ?
Convertimos las unidades al SI
vf = (1080 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 300 m/s
Calculamos el tiempo
t = (vf - vi)/a
t = (300 m/s - 0 m/s)/25 m/s²
t = (300 m/s)/25 m/s²
t = 12 s--------------Respuesta