Hello everybody. I registered today in this forum and this is my first post. I'm Italian, therefore sorry for my ugly english. Studying physics (for my personal curiosity) I proposed myself two problems I couldn't solve. One of these, is: at the point x=0 (of a one dimensional space) there is a fixed object of mass M and at distance x=x0 there is a second object. I'd want to find the x(t) function for the second object subjected to the gravitational force of the first. M - - - - - <--- m x=0 . . . . . . . . x=x0 I obtained a(x) = - GM/x2, but from this I'm not able to get x(t). Some advice to solve this problem?