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Los datos que te dan son:
h = 100 m
g = - 9,8 m/s²
vf = 0 m/s
vi = ?
Calculamos:
vf² = vi² - 2gh
(0 m/s)² = vi² - 2 (9,8 m/s²) (100 m)
0 m²/s² = vi² - 2 (980 m²/s²)
0 m²/s² = vi² - 1960 m²/s²
1960 m²/s² = vi²
vi² = 1960 m²/s²
vi = √1960 m²/s²
vi = 44,27 m/s
Respuesta.
vi = 44,27 m/s