[quote=Kadaeux]
Effectively impossible. 
[/quote]

The ramming spaceship would be already accelerating towards them, and a ramming ship could keep its trajectory aligned as the no stealth thing goes both ways; every time they start changing trajectory, the ramming ship would too. Just like with a missile.

And ramming would likely be done against a bigger ship, which due to inertia likely would have a harder time changing trajectory or accelerate even if the potential speed of a bigger ship is much bigger than a smaller ship.