Ok then, what happens if you make a tunnel through the earth, and you jump in it? (lets say you WONT be crushed by gravity/fear/speed)
This is what i think. First, you jump. Nothing strange happens (you feel like falling next to a 90 degree surface) until you are in the middle of the earth. there, as you fall, your internal ear will try to make some kind of equilibration between the gravity and your speed (starting with the earth's middle, the surface next to you that appeared next to you will become smoother continuous until it becomes a plane 0 degree surface. you lose a degree every 133,(3) kilometers(used dah computer)). The problem is that in the point where the surface is 0 degree you had just passed through 3/4 the earth, and you have like 12000 kilometers to pass by leg. But it is simply impossible to pass them, because the more walk, the surface becomes more abrupt, to the point it is too abrupt for a man to pass, making you fall.
So the answer to (Can a man go threw the Earth to reach its opposite side?) Is...no!, and he couldn't return either, being trapped in the earth
