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Two charge particles are moving such the...

Two charge particles are moving such the distance between them remains constant. The ratio of their masses is 1 : 2 and they always have equal and opposite momentum. The particles interact only though electrostatic force and no other external force is acting on them. The electrostatic interaction energy for the pair of the particles is `– U_0`. Find the kinetic energy of the lighter particle. How does the kinetic energy change with time?

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The correct Answer is:
`(U_(0))/(3)`
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