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Los datos que tienes son:
vi = 0 m/s
d = 50 m
t = 5 s
a = ?
Calculamos la aceleración
d = 1/2 at²
50 m = 1/2 (5 s)² (a)
50 m = 1/2 (25 s²) (a)
50 m = 12,5 s² (a)
(50 m) / (12,5 s²) = a
4 m/s² = a
Respuesta.
a = 4 m/s²