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A particle of charge +2.1 μC is released from rest at the point x = 60...

A particle of charge +2.1 μC is released from rest at the point x = 60 cm on an x axis. The particle begins to move due to the presence of a charge Q that remains fixed at the origin. What is the kinetic energy of the particle at the instant it has moved 12 cm if (a)Q = +93 μC and (b)Q = –93 μC?

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