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Sorry, I didn't see you subbed in gravity -9.8, I thought u subbed in 9.8 sorry. However, am I able to use v=u+at to find uy?

isn't the formula delta y=Uy*t + 1/2 *gt^2 and the answer you get for Uy=-24.5m/s which we in physics we can just change the negative when we want so the answer is Uy=24.5 m/s. Also, instead of using the displacement formula, can i use v=u+at where v=o, u=?, a=9.8 and t=5 to find uy?

A projectile has a range of 1240 metres and a flight time of 5 seconds. At what velocity is it projected?