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t = v/g
20=-g/2*(v/g)^2+v*v/g
20 =-V ^2/2*9.8 + V^2/9.8
20*9.8 = V^2-V^2/2
20*9.8 = V^2/2
2*20*9.8 =V^2
√(2*20*9.8)=V
64.8