Rocket in space

1. The problem statement, all variables and given/known data
If the rocket has an initial mass of 6000kg and ejects gas at a relative velocity of magnitude 2000m/s , how much gas must it eject in the first second to have an initial acceleration of 25.0m/s^2

2. Relevant equations

3. The attempt at a solution

i tried using momentum to solve the question
6000(2000)=Ft, t=1s, F=12000000, then F=MA,so i 12000000=25m,
but it was not correct
then i tried to used the above v equation, but i don't have the v_ex
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