It will be so great if someone help me with this, and try to understand what's my point and what I am trying to say. I have asked a question few days ago, and it was closed because, apparently it wasn't clear. Please be patient with me and tell me if I'm right with this or not, trying to explain all details if I'm not. Thanks to all who will give time to my question, and think about it.
Einstein's equivalence principle says we cannot distinguish between a gravitational field and a uniformly accelerated rocket. I possibly have found a way which someone can know he isn't in earth because he will realize something strange happens in the accelerated rocket or cabin. But first, we have to emphasize some things. As we know, by these equations $F=ma$, $KE=(mv^2)/2$, $\Delta P=Nt$, $P=mv$, increasing mass, means increasing force, kinetic energy and momentum.
I'll give you this example. We have two rockets (A and B) going at 1 g, in both cases the person inside the rocket, drop a ball from, for example, 1,5 m. In both cases everything is the same, the acceleration of the rockets, the distance between the ball and floor, the weight of the ball, the time of the collision, etc...except mass, in B, the rocket has more mass than A. Assuming the floor of the rocket will hit the ball, and assuming it's a perfect elastic collision, in B the ball should go further because there is more force and kinetic energy in the collision (Because there is more mass).
So, that means if we add the enough mass to the rocket ($F=ma$=>with more mass, comes more force, $KE=(mv^2)/2$=>with more mass comes more kinetic energy), we can make the ball surpass the height of the drop in eyes of the inside observer, and the person will know he isn't on earth by just drop a ball and observing it surpass the height.