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g = 10 m / s²
h = 120 m
Vo = ?
Vf = 0
t = ?
Formula
h = Vo² / 2 g
Vo² = 2 g h
Vo = √ 2 g h = √ 2 (10 m/s²)(120 m) = 48.98 m/s
t = Vo / g = 48.98 m/s / 10 m / s² = 4.898 s