[ninty]

Hold the phone. I thin I made somewhat of a mistake.

Inertia would be present in the acceleration stage. However, once at a crusing speed inertia would no longer be a threat. (Duh, on my part. That is the definition of Inertia oOo: )

Therefore, a gradual speed up would be required to the maximun speed of the ship, and once there a gradual slow down would also be required.

We have the same problem on earth. If they wanted to build a train that uses a vacuum to propel the train, a gradual speed up and slow down would be required. However at the trains crusing speed, everything would be OK. Now to factor in or out gravity, i'm not sure of the effects. You might have to ask Einstein about that, but I think he had trouble relating the universe to inertia.

I'll have to get onto that once I finish with relativity.