Physics problem: how to do, thanks.?

t = √(2h/g) = √(24/9.8) = 1.56 s

v = √(2gh) = √(24•9.8) = 15.3 m/s (horizontal component)
vertical component = 12 m/s
combined, that is
v = √(12² + 15.3²) = 19.5 m/s
θ = arctan (15.3/12) = 51.9º with horizontal