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 large. So 45,000 N × 4 = 180,000 N, which is choice D.

AI-written and checked against the verified answer.