So if an object has a velocity expressed by the vector <-3,0> and is being accelerated toward another object with the vector <-1,-2>....... After one second, the object will have moved from (0,0) to (-4,-2) - calculated by adding the vectors.. My question is after the first second does the object keep the initial -3 velocity vector? I am trying to map orbital motion and have so far been taking the sum of the initial two vectors and adding them to the gravity vector. Then the resulting vector will be added to the new gravity vector and so on... However, this is getting unrealistic results.. So which vectors are applying to the object? Does the initial velocity vector always apply to the object or does the vector decrease or does it drop after the first second? Thank you for any help.