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Find the fraction of decrease of the kinetic energy of a neutron of mass m, in head-on collision
with an atomic nucleus of mass m2 which is initially at rest -----------
4m?m3
(m1+m2)2
2m2 m1
(m,+m2)²
4m2 m,
(m1+m2)²
2m2 m?
(m,+m2)²

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