Neglecting air resistance, the horizontal velocity will not have changed (i.e. it remains 2.45 m/s).
The vertical velocity starts at 0 m/s and accelerates for 2.30 s (due to gravity).
9.8 = (x-0)/2.3
x = 22.54
Therefore your vertical velocity is 22.54 m/s.
a) It would remain the same, because there is no force, and thus acceleration, in that direction. So, it would just be 2.45 m/s.
b) Usev=v0+at
Because v0=0 in the y direction, it is just
v=at
It said that t=2.3 s, and a=9.8. Plug that in...
v=2.3*9.8=22.54 m/s