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h1 = 1,8 m
x = 2√h×h1
1,2 = 2√h×1,8 kedua ruas di pangkat 2 agar akar bisa hilang
1,44 = 4×h×1,8
1,44 = 7,2h
h = 1,44/7,2
= 0,2 m
V = √2gh
= √2×10×0,2
= √4
= 2,00 m/s => B