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Vy= 20-10(2) = 0 m/s
h-h₀= V₀y.t + ¹/₂ g t²
h-2,1 = 0 + ¹/₂ (10) 2²
h-2,1= (2)(10) = 20
h = 20 + 2,1
h= 22,1 m