when 2 masses are 1.0 apart they exert a gravitational force of 1 n on each other?

Question

if mass 2 is replaced by a third mass which is 200 times greater than mass 2 what will be the gravitational force between mass 1 and mass 3?
also- if mass 1 and 3 are sperated to 10.0 m apart what would be the gravitational force?

Answer 1

Grav. force F = Gm1m2/r^2. Multiply m2 by 200 and you do the same to F. Multiply r by 10 and you decrease F by a factor of 10^2.