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s = 500 m
g = 9,8 m/s²
α=?
s = vo² sin 2α x 1/g
sxg = vo² sin 2α
500 x 9,8 = 70³ sin 2α
4900 = 4900 sin 2α
1 = sin 2α
sin 90 = sin 2α
90 = 2α
α = 45°