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h = 40 m
g = 9.8 m/s²
t =?
Vf = ?
h = 1/2 gt²
t² = 2h/g
t² = 2*40 m/9.8 m/s²
t² = 80/9.8 s²
t = √8.1633 s²
t = 2.857 s
g = (Vf-Vo/t
Vf = gt
Vf = 9.8 m/s²* 2.857 s
Vf = 28 m/s