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Vo = 4 m/s
t = 1 s
g = 10 m/s^2
a) Kecepatan saat menyentuh air
V = Vo + g.t
V = 4 + 10.1
V = 14 m/s
b) Tinggi sumur
h = Vo.t + 1/2.g.t^2
h = 4.1 + 1/2.10.1^2
h = 4 + 5
h = 9 meter
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