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vi = 0 m/s
h = 20 m
g = 9,8 m/s²
t = ?
vf = ?
Calculamos el tiempo.
t = √2h/g
t = √2 (20 m) / 9,8 m/s²
t = √40 m / 9,8 m/s²
t = √4,08 s²
t = 2,02 s
Calculamos la velocidad.
vf = vi + gt
vf = gt
vf = (9,8 m/s²) (2,02s)
vf = 19,79 m/s