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Los datos son:
a = 5 m/s²
vf = 32 m/s
t = 4 s
vi = ?
Calculamos su velocidad inicial
vi = vf - at
vi = 32 m/s - (5 m/s²) (4s)
vi = 32 m/s - 20 m/s
vi = 12 m/s
Respuesta.
vi = 12 m/s