1. The problem statement, all variables and given/known data A neutron moving with speed v makes head on collision with a hydrogen atom in ground state kept at rest. Find the minimum Kinetic energy of the neutron for which inelastic(completely of partially) collision may take. (mass of neutron=mass of hydrogen=~1.67*10-27) 2. Relevant equations Bohr's model of hydrogen atom. 3. The attempt at a solution I didn't know even how to proceed?? can u please help.