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4. Assume that there is a straight tunnel through the earth connecting the north pole with the south pole. An object with a mass

4. Assume that there is a straight tunnel through the earth connecting the north pole with the south pole. An object with a mass m is released at the north pole and falls towards the earth's center. a) What is the time needed for the object to reach the south pole (2P) b) What is its velocity at the earth's center? (1P)

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