Hello 1. The problem statement, all variables and given/known data I have two known points A and B. I want to throw a ball from A to B with a certain angle. Obviously I also know the gravity. For example: (in metres) Known point A: (0, 0, 0) point B: (30, 0, 10) direction: (0.949, 0, 0.316) gravity: 9.82 m/s angle: 45° or PI / 4 Wanted acceleration: ? How can I calculate the initial acceleration needed at point A for the ball to land on point B? Thanks in advance.