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Explicacion
Vo = 19 m/s
g = 10 m/s²
R = ?
Formula
R = Vo² / g sen 2 α
g R = Vo² sen 2 α
g R / Vo² = sen 2 α
α = arc sen (g R / Vo²)/2
α = arc sen (10 m/ s² (1) / (19 m/s)²/2 = 0.793 °