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V² = Vo² - 2 g h; para este caso es V = Vo/3; luego:
Vo²/9 = Vo² - 2 g h;
Por lo tanto Vo²/9 - Vo² = - 2 g h
8/9 Vo² = 2 g h;
Vo = √(9/4 . 10 m/s² . 40 m) = 30 m/s
Saludos Herminio