# Force of gravity problem.

linuxux

## Homework Statement

Force of gravity on a spaceship is 900N. What is the force when mass is double and distance from earth center is 1/4 as far?

## The Attempt at a Solution

the answer i got was 28800N, but i just applied proportionalities apparent from in the equation $$F=G\frac{M_{e}m_1}{r^2}$$ . Is it the right answer?