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Los datos son:
vi = 0 m/s
h = 78,4 m
g = 9,8 m/s²
t = ?
Calculamos el tiempo.
d = 1/2 gt²
78,4 m = 1/2 (9,8 m/s²) (t)²
78,4 m = 4,9 m/s² (t)²
(78,4 m) / (4,9 m/s²) = t²
16 s² = t²
√16 s² = t
4 s = t
Respuesta.
t = 4 segundos