The gravitational force between two objects is 45,000 N. What will be the gravitational force between the two objects if the distance between the objects is reduced by one-half?

Gravitational force follows an inverse-square relationship with distance: if the distance is halved, the force becomes four times as strong. So 45,000 N × 4 = 180,000 N. The correct choice is 180,000 N.

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