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I started using the eqution

(Vfy)^2=(Voy)^2+2*Ay*(delta Y)

Voy=Vosin(theta)=.47Vo

Vfy=1.954*Vosin(theta)=.92Vo

(.92Vo)^2=(.47Vo)^2+(2*-9.8*-46)

Vo=37.9

but my answer is wrong and I can't think of another way to answer the problem.....Any ideas?

Thanks for your time!