If a car accelerates because there is an balanced force
acting on it how can it move if for every action there is an equal and
You are assuming that the action and the opposite reaction will act on the
same object. Not so. Think of the quintessential example of the gun firing
a bullet. The action force acts on the bullet while the reaction force acts
on the gun.
So why does the bullet move so much faster than the gun? Can you figure it
out? Check out the law of the conservation fo momentum.