1. The problem statement, all variables and given/known data An object (mass=1000kg) is dropped from 498,447 metres above the earth's surface, what will be it's velocity upon impact? 2. Relevant equations Energy equivalency. 3. The attempt at a solution 2G*(Earth's Mass)*((1/(earth radius))-(1/earth radius + 498,447))=v^2 v[tex]\approx[/tex]3,001 m/s Everything looks O.K., but the book has a different answer, am I doing it right and the book is wrong or vice versa? Thank you.