The title is somewhat ambiguous and I apologize beforehand for lacking any real technical vocabulary or an extensive knowledge of physics. This query stems from reading some discussions of a moderately popular MMO called "EVE Online." The game is set in some area of the universe where the player pilots a spacecraft and engages in interstellar combat with other players or NPCs (non-player characters). There was a discussion about the effect of a ship's velocity versus its angular velocity, in relation to another craft, on the sustained damage of a fired projectile. I understand this is all simply a few pixels on a screen being placed according to a series of calculations programmed into the servers, but it led me to wondering some things about velocity in space flight. If I'm not mistaken, if one were to drive on the highway and fire a slingshot from a window, the projectile would be moving (although only momentarily) at the combined velocity of the vehicle and slingshot release -- the velocities in this case seeming to be somewhat additive until gravity and air resistance brings the projectile down. My question is this: If one were to piggyback spacecraft onto spacecraft onto spacecraft, and launch each in succession (assuming that each craft has to ability to achieve the same maximum velocity), would the final ship be moving at a velocity that is equivalent to its maximum velocity multiplied by the number of vessels in the chain? If not, for what reason(s)? Furthermore, in thinking this through it seems as though that may not be possible under current conditions. Hypothetically, if one were able to simulate gravity on the craft and also allow enough space for the ship to achieve maximum velocity before exiting the initial vessel, would it then be possible? Sorry for the somewhat frivolous rantings of a bored law student, but sometimes curiosity just gets the better of me. No rush on an answer as I'm sure there are many more important topics being discussed besides a game-inspired physics question. Thanks.