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## Homework Statement

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

## Homework Equations

v=v_exln(m_0/m)

## 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,

m=480000

but it was not correct

then i tried to used the above v equation, but i don't have the v_ex