Posted by kelsey on .
Mass A (7 kg) and mass B (10 kg) sit on the ground, 2 m apart.
a.) What is size of the the gravitational force:
on A from B? N
on B from A? N
b.) What is the size of the gravitational force:
on A from the Earth? N
on B from the Earth? N
once again, i am using the wrong equation! please help...

physics help 2 please!! 
bobpursley,
GravityForce=G*MA*MB/distance^2

physics help 2 please!! 
drwls,
To do part b, you will need the radius of the Earth, not the distance between A and B. OR you can just multiply the mass (A or B) by g.