Practice question
Question
A neutron (1u) at 5×105m/s collides elastically with a deuterium (2u). What fraction of its kinetic energy is transferred?
Explanation
Kinetic energy K=½mv² and potential U=mgh per NCERT. Energy conservation K+U=constant for conservative forces. Substituting m, v, h gives 88.9% as energy, matching option A.