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Los datos que tienes son:
vi = 0 m/s
vf = 85 km/h
t = 20 min
a = ?
Pasas las unidades al SI
vf = (85 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 23,61 m/s
1 minuto = 60 segundos
60 * 20 = 1200 segundos
Calculas la aceleración.
a = (vf - vi)/t
a = (23,61 m/s - 0 m/s)/1200s
a = (23,61 m/s)/1200s
a = 0,0197 m/s²--------------Respuesta