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Los datos que tienes son:
vi = 0 m/s
d = 860 m
t = 12 s
a = ?
Calculamos la aceleración
d = 1/2 at²
860 m = 1/2 (12 s)² (a)
860 m = 1/2 (144 s²) (a)
860 m = 72 s² (a)
(860 m) / (72 s²) = a
11,94 m/s² = a
Respuesta
a = 11,94 m/s²