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If a stone thrown from a bridge strikes the water 10.0 m below after 1.70 s, what was the stone's initial velocity?

My first attempt was to use Δy = vyi(Δt) +0.5(g) (Δt)^2 because I understand that the time to fall is dependent only on gravity.

I keep getting an initial velocity of -14.22 m/s. The given answer is 2.45 m/s upward. What gives?

I get the feeling that I'm missing something simple.