Question

Gravitational force between two points mass m and m seperated by a distance r is f.Now if a point mass 3m is placed next to m the force on m will be

Answer 1

If two point masses 'm' are separated by a distance r is F =Gm^2/r^2,

Now one of the mass become 3m then the force between two masses is F'=G(m)(3m)/r^2

F' = 3Gm^2/r^2

F' = 3F