Sx=Uxt
Therefore 17.34 = Ux(1.568)
Ux=10.93ms-1
Sy=Uyt + 1/2ay(t^2)
-1.93=Uy(1.586) - (0.5x9.8x1.586^2)
Therefore Uy = 6.55 ms-1
U = √((10.93^2) + (6.55^2))
= 12.75ms-1
angle = tan^-1 (6.55/10.93)
= 30º56'
Therefore U = 12.75m/s at 30º56' above horizontal