Force to stop a space ship

1. The problem statement, all variables and given/known data
A spaceship is accelerating at ##1000# m/(sec per sec). How much force is required from the backthrusters to completely stop the spaceship?

2. Relevant equations

3. The attempt at a solution
Let’s assume the spaceship has mass ##m## and no mass is lost when firing the backthrusters.
Using Newtons second, we have
$$
\sum F = 1000m.
$$
The only force would be the velocity from the backthrusters correct?
So we have
$$
-v_0x = 1000m.
$$
Is this correct? How do I find the force needed to stop the ship?

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