There is no need to do anything with the law of gravity. Once you become meditative, a different law applies to you; the law of grace. You become available to a different world; the world of grace. Something goes on pulling you upwards.
Just as gravitation pulls you downwards, something goes on pulling you upwards. No need to do anything with the law of gravitation. You have just to open a new door into your being from where the law of grace becomes available to you.