Suppose you have a frictionless and perfectly balanced conveyor belt going into space (and back). The belt is driven by a motor on earth. Suppose you want to send a person who weighs 100kg into space and you boost them onto the conveyor belt at 1m/s with the conveyor belt running at 1m/s (the boost is independant of the conveyor belt so it does not have to accelerate them). To maintain that velocity of 1m/s requires a force opposite to that of gravity which is approx. 1000N. Because Power = Fv does that mean that the motor must only generate a power of 1KW (1000N x 1m/s) ? i.e. with this configuration you can get into space with very little power if you are prepared to go slowly enough ? E.