Hi, I posted this question a while back on these forums. Didn't get an answer though. How long will it take for two identical masses to reach each other by their attractive gravitational force? Their masses can be 1kg and the distance between them 1m to simplify it. Do NOT assume that the force is constant. It is not, it's inversely proportional to r^2, the distance between them. I'm stumped on this one. Thanks.