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g = 9.8 m/s²
Vf = 0 (porque el cuerpo se detiene al llegar a la altura máxima)
h = ?
t = ?
Vf² = Vo² -2gh
Vo² = 2gh
h = Vo²/ (2*g)
h = (8 m/s)² / (2*9.8 m/s²)
h = 64 m²/s² / 19.6 m/s²
h = 3.265 m
-g = (Vf-Vo)t
-g = -Vo/t
t = Vo/g
t = 8 m/s / 9.8 m/s²
t = 0.816 s