Energy and Momentum: In a certain nuclear reactor, neutrons suddenly collide with deuterons, which have twice the mass of neutrons. In a head-on elastic collision with a stationary deuteron, what fraction of the initial kinetic energy of a neutron is transferred to the deuteron?
A. 1/2
B. 1/3
C. 3/4
D. 5/6
E. 8/9
Answer: E
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