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Question 1

How does the force of gravitation between two objects change when the distance between them is reduced to half ?

Answer

We know that the universal law of gravitation, 

gravitational force acting between two objects is inversely proportional to the square of the distance (r) between them, i.e.,

If distance r becomes r/2, then the gravitational force will be proportional to 

When the distance is reduced to half the gravitational force becomes four times larger than the previous value.

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