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One-half second after starting from rest, a freely falling object will have a speed of about: a)10 m/s b)2.5 m/s c)5 m/s d)20 m/s

I find the answer to be (b), 2.5 m/s, but my husband assures me I am not solving it correctly...that I am not using the right formula. I am using a=dt**2 even tho I know acceleration isn't speed...but I don't know what formula to use! This is a physics for health majors class, we don't use calculus. We barely use algebra, and we're all flunking, flunking...

Can some Big Brain please provide me with the formula to solve for speed? The only time I can solve free fall probs is when we are solving for distance and then I use d=1/2gt**2.

Thanking you in advance...