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Tunnel through the Earth

What if we make a tunnel through the earth and drop a ball or any other body into it? How would the gravity behave on the ball, and , will the ball pop-up on the other side? If yes, then how much time will it take? A question, which is usually asked in competitive exams and for general interest.  This article is a descriptive analysis of bodies inside the tunnel through earth. To do so, we assume no- frictional forces…