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Los datos que tienes son:
vi = 18 km/h
vf = 93,6 km/h
t = 7 s
a = ?
Pasas las unidades al SI
vi = (18 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 5 m/s
vf = (93,6 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 26 m/s
Calculamos la aceleración
a = (vf - vi)/t
a = (26 m/s - 5 m/s)/7s
a = (21 m/s)/7s
a = 3 m/s²--------------------Respuesta