1. The problem statement, all variables and given/known data If a person is sitting in a train which's starting from rest & he throws a ball upward,then where'll the ball fall? 1)At the position where it's thrown? 2)Behind the person? or 3) Ahead him? Thanks. 2. Relevant equations Nill. 3. The attempt at a solution May be theory of relativity is involed,but not sure.