A neutron is moving with velocity u. it ...

A neutron is moving with velocity u. it collides head-on and elastically with an atom of mass number A. If the initial kinetic energy of the neutron is E, then how much kinetic energy will be retained by the neutron after reflection?

`(A-1)/(A+1)`

`((A+1)/(A-1))^(2)`

`(A+1)/(A-1)`

`((A-1)/(A+1))^(2)`

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