This result is not within the capabilities of the system. Those laws which say what is impossible are the best tested, the most general and the most absolute of the laws of physics. Anyone introducing an unknown force must explain why it has never been detected and why it has never before been found necessary. So here is a firm statement. If something is forbidden by a well-established physical law, then it ain't going to happen, no matter how much you might want it.
All gravitational forces are attractive, there is no repulsive gravitational force.
H. G. Wells' Cavorite is impossible. Since nothing can shield or cancel gravity no amount of wishing, or meditating, is going to make you lift off the ground without mechanical support. You can't accelerate an object without applying a force to it. Flying saucers can't hover motionless in thin air and if they made instantaneous stops and starts they would squash their crews to a pulp. Another absolute law is that no information or material object can travel faster than light.