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OpenStudy (anonymous):

Canadian nuclear reactors use heavy water moderators in which elastic collisions occur between the neutrons and deuterons of mass 2.0 u. What is its kinetic energy, expressed as a fraction of its original kinetic energy? b) what is its kinetic energy expressed as a fraction of its original kinetic energy? c) how many such successive collisions will reduce the speed of a neuron to 1/59000 of its original value?

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