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mgh=mv²/2+mgh₁ => gh=v²/2+gh₁
v=g*t
gh=(g*t)²/2+gh₁ =>h=gt²/2+h₁ =>h₁=h-gt²/2
gt² to przebyta droga czyli h-h₁
h₁=h-gt²/2 => h₁=h-(h-h₁)/2 => h₁=h-h/2-h₁/2 => 3/2h₁=h/2 => 3h₁=h => h₁=h/3