Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .

Give me some answer choices and i will be happy to

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