If a tunnel is dug from North Pole to South Pole of the Earth, and a ball is rel

Question

If a tunnel is dug from North Pole to South Pole of the Earth, and a ball is released at rest at the North Pole end of the tunnel, the ball will have---- at the center of the Earth (A) greatest speed and experience least force (B) least speed and experience greatest force (C) greatest speed and experience greatest force (D) least speed and experience least force When a door rotates, the mid point of the door and a point at the handle of the door have (A)same rotational speed and same tangential speed (B)same rotational speed and different tangential speed (C)different rotational speed and different tangential speed (D)different rotational speed and same tangential speed

Explanation / Answer

14. greatest speed and experiences least force

15. same rotational speed and different tangential speed

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