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(A) The mass of an object is an intrinsic property of matter and does not change regardless of its position in the universe.As the stone moves toward

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(A) The mass of an object is an intrinsic property of matter and does not change regardless of its position in the universe.As the stone moves toward the center of the Earth,the gravitational force acting on it decreases,meaning its weight $(W = mg)$ decreases.At the center of the Earth,the gravitational acceleration $(g)$ becomes zero,so the weight and the gravitational field intensity also become zero.Therefore,only the mass of the stone remains constant throughout the motion.

$A$ hole is drilled through the Earth along a diameter and a stone is dropped into it. When the stone reaches the center of the Earth,which of the following quantities remains constant?

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