1d motion

Let's say a object travels distance h , with acc a starting from rest

H = 1/2at^2
t = root [2ah]

V = u + at
V = a root[2ah]


But If we do v2 - u2 = 2as

V2 = 2ah
V = root [2ah]


One of them has to be wrong , how and why?
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