If there were a tunnel directly through the center of the earth what would happen when someone jumped in?

Would they shoot out the other side? Bounce back and forth until they eventually sit suspended in the exact center? Or maybe you would gain speed until you hit terminal velocity, then as you get closer to the center your speed would slow down until you come to a slow and gentle stop at the center? Discuss. And... show more Would they shoot out the other side? Bounce back and forth until they eventually sit suspended in the exact center? Or maybe you would gain speed until you hit terminal velocity, then as you get closer to the center your speed would slow down until you come to a slow and gentle stop at the center? Discuss.

And I know you can't actually build that tunnel so don't bother to mention the impossibility. It's hypothetical. ;-)
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