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At time t, the kinetic energy of a part...

At time `t`, the kinetic energy of a particle is `30.0J` and the potential energy of the system to which it belongs is `10.0J`. At some later time `t_f`, the kinetic energy of the particle is `18J`, what are the potential energy and the total energy at time `t_f`? If the potential energy of the system at time `t_3` is `5.00J`, are any non-conservative forces acting on the particle? Explain.

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