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Los datos que tienes son:
vi = 0 m/s
vf = 72 km/h
t = 20 s
a = ?
Pasas las unidades al SI
vf = (72 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 20 m/s
Calculamos la aceleración
a = (vf - vi)/t
a = (20 m/s - 0 m/s)/20s
a = (20 m/s)/20s
a = 1 m/s²
Respuesta
a = 1 m/s²