help with gravitational force

Question

1.  what happens to the gravitational force between two objects if the distance between them is increased 4 times?

 

a.  increased 4 times

b.  increased 16 times

c.  reduced 4 times

d.  reduced 16 times

 

I know it has to be decreased so I think the answer is c ???

 

2.  assuming the distance between the objects were the same, which set of objects would have the greatest gravitational attraction?

 

a.  object A with a mass of 3 kilograms and object B with a mass of 2 kilograms

b.  object A with a mass of 3 kilograms and object b with a mass of 3 kilograms

c.  object A with a mass of 2 kilograms and object b with a mass of 2 kilograms

d.  all sets would have equal gravitational  attraction

 

I think D is the answer

 

 

thanks

 

Happy 4th!

Answer 1

C is the answer to the first question because gravitational force is inversely proportional to the square of thedistance between oblects. 

 

B is the answer for the second question because the gravitational for is directly proportional to the product of the objects' masses 

Answer 2

The explanations are correct, but the answer for the first question is D.