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h(2) = 80. sin 60. 2 - 1/2 .10.2²
= 80. 0,8. 2 - 20
= 108m
titik p titik puncak
t = -b/2a
b = Vo sin α
= 80 .0,8
= 64
a = -1/2g = -1/2.10 =-5
t = -64/ (2.(-5) )
= 6,4 s