An antitank weapon fires a 4.00-kg rocket which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube.

An antitank weapon fires a 4.00-kg rocket which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?