Question

A 112 kg man stands 551 m from a building of 25,500 kg. What is the gravitational force of the man due to the building? What is the gravitational force of the building due to the man?

Answer 1

$F = \frac {-G*m*M}{r^2}$

Both the bodies with masses m and M exert same force F on each other.

The negative sign implies Attractive Nature of the force.

F =$- 6.67 *\frac{ 112*25500}{551^2}$ *10^-11 N

F = -6.275 * 10^-11 N (approx)