The gravitational force between two objects is 1600 N. What will be the gravitational force between the objects if the distance between them doubles?

Gravitational force follows the inverse-square law: it is inversely proportional to the square of the distance between the objects. Doubling the distance makes the force one-fourth as large, so 1600 N ÷ 4 = 400 N. The correct choice is 400 N.

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