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Los datos que nos dan son:
vi = 0 m/s
vf = 4 m/s
t = 20 s
a = ?
Calculamos la aceleración
a = (vf - vi)/t
a = (4 m/s - 0 m/s)/20s
a = (4 m/s)/20s
a = 0,2 m/s²
Respuesta.
Opción b)