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vo = 20 m/s
α = 60
ditanyakan :
t max = ?
jawab :
h max = vo² sin²α x 1/2g
h max = 20² sin²60 x 1/20
h max = 20 x 3/4
h max = 15 m
t max = √2 hmax/g
t max = √2 x 15/10 = √30/10 = √3 s