I think this is just a tad late ;)
i was struggling with Q1 as well and this is what i got!
Q1)
final displacement= 0
Uy = usin 15'
therefore using:
r = ut + 0.5at^2
0= usin15t -4.9t^2
t = usin15/ 4.9
Now using Uxt = delta x (horzontal component which we know is 10m)
Ux = ucos15
delta x=...