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vo = 40m/s
α = 60
h maks dari tanah =?
h maks = vo² sin²α x 1/2g
h maks = 40² sin²60 x1/20
h maks = 1600 (1/2 √3)² x 1/20
h maks = 80 x 3/4
h maks = 60 m
h maks dari tanah = ho + h maks
h maks dari tanah = 20 m + 60 m = 80 m