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1,80 x 2 = 0,9 x v²
3,6 = 0,9 x v²
v² = 3,6 : 0,9 = 4
v = √4 = 2
1,8 = ½ . 0,9 . v²
3,6 = 0,9v²
v² = 3,6/0,9
v² = 4
v = √4
v = 2 m/s