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h = 78,4 m
g = 9,8 m/s²
t = ?
t² = 2·d / g
t² = 2 · 78,4 m / 9,8 m/s²
t² = 156,8 m / 9,8 m/s²
t = √16 seg²
t = 4 seg -----> solucion
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