“Now lets see them slow it down once its going.”
True, but any “free fuel” you don’t have to carry is a Good Thing. With a nuclear powered ion rocket engine, solar pressure going away from the sun and using the rocket to come back would be viable. Slow to accelerate and decelerate, but doable especially on an unmanned flight.
No question. It’s just nice to be able to stop.
How about that positive charge building on the vehicle while emitting electrons? Positive and negative charges attract.