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Vo = 0
h = 80m
g = 9.8m/s²
t=?
Vf=?
Vf² = Vo² + 2gh
Vf = √2 gh
Vf=√2×9.8m/s²×80m
Vf = √1568m²/s²
Vf = 39.6 m/s
d = Vot + gt²/2
d = gt²/2
t = √2d/g
t = √2×80m/9.8m/s²
t = √ 16.3s²
t = 4.03s