I have an object on object.Y = 400. I drag that object to object.Y = 50. The distance is 350 ( I don't change the object.X). Then I drop the object and let it do a free fall to object.Y = 400 again. Based on constant timer (every tick add dt to timer) I calculate the fall distance as y=(1/2)*10*timer*timer. How can I match this distances?