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h=1/2*g(t^2+2*(v/g)*t)
h=1/2*g((t+v/g)^2-(v/g)2)
2h/g=(t+v/g)^2-(v/g)^2
2h/g+(v/g)^2=(t+v/g)^2
√(2h/g+(v/g)^2)=t+v/g
t=√(2h/g+(v/g)^2)-v/g