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Los datos dados son:
h = 490 m
g = - 9,8 m/s²
vf = 0 m/s
vi = ?
Calculamos la velocidad inicial de lanzamiento
vf² = vi² - 2gh
(0 m/s)² = vi² - 2 (9,8 m/s²) (490 m)
0 m²/s² = vi² - 2 (4802 m²/s²)
0 m²/s² = vi² - 9604 m²/s²
0 m²/s² + 9604 m²/s² = vi²
9604 m²/s² = vi²
vi² = 9604 m²/s²
vi = √9604 m²/s²
vi = 98 m/s
Respuesta.
vi = 98 m/s