Also, if you dig a tunnel between any two points A and B on the earth's surface and jump inside -assuming no friction and that the only force is gravity- the ti

Also, if you dig a tunnel between any two points A and B on the earth's surface and jump inside -assuming no friction and that the only force is gravity- the time from A to B is the same for any point A and B [1]. [1] https://physics.stackexchange.com/questions/286710/period-of-oscillation-through-a-hole-in-the-earth?answertab=scoredesc#tab-top https://physics.stackexchange.com/questions/286710/period-of...