1. The problem statement, all variables and given/known data Question 5 (c) (ii) from the paper physics 2 higher tier January 2014 by wjec. There is no mark scheme at the moment of the paper and I do not understand the question. The paper is at the bottom of "papers" at http://www.wjec.co.uk/qualification...tml?pastpaper=true&subject=Physics&level=gcse and the question is " if a barium nucleus is released with the same kinetic energy as a neutron, explain why the size of its velocity would only be one twelfth (1/12) of the velocity of a neutron". Please help! 2. Relevant equations N/A 3. The attempt at a solution Barium has a greater mass than a neutron???