In the 2012 film Total Recall, a straight tunnel exists between two antipodal places on Earth and work shuttle passes through the tunnel by dropping into it, reaching maximum velocity at the centre of the Earth, and rising out the other side. In the film this takes 10 minutes (I think), but how long would it take in "real life" (assuming it were possible to construct)?
I believe this is SHM and I have an answer written down from someone else of 42 minutes. I am not sure how he got it though. Thank you.