Hi, all. I have a problem I wish to solve. It's not from a text book, I thought of it myself. If two masses of 1 kilogram each are 1 metre apart in space, how long will it take for them to reach each other from their attractive gravitational forces? Remember that the force (and hence the acceleration) acting on each mass increases as the distance between them decreases, (by F=Gm1m2/r^2). Assume that no friction or other gravitational forces act on the masses. Thanks.