GREETINGS!
Answer is 553 m/s
By the formula of,
Vf = Vi + at
where,
Vi is initial velocity
a is acceleration due to gravity
t is time.
As we know that,
F = ma
so,

put this in the final velocity formula,
Vf = Vi + (F/m)t
Vf = 125 + (25000/440)7.5
Vf = 551.13 m/s
HOPE IT HELPS!