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m = 20
Vo = 100
g = 10
a. h max = Vo²/2g
= 100² / 2.10
= 100.100 / 2.10
= 500 m
b. Vt --> h = 80
Vt² = Vo² - 2gh
= 100² - 2.10.80
= 10.000-1600
= 8400
Vt = √8400
= 20√21 atau 91,65 m/s