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Law of Conservation of Energy

Which of the ...

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Which of the following is wrong? a) W(external force) =Change in mechanical energy,if workdone by non-conservative forces is zero b.W(Conservative )+W(non-conservative )+ W(external force) =change in kinetic energy c.-Change in potential energy=W(conservative) dMechanical energy of system remainsalways constant

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Q. A body is freely moving under the action of a conservative force. If the work done by this conservative force is 'a', change in kinetic energy 'b' & magnitude of change in potential energy is 'c', then

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Q. A particle is taken from point A to point B under the influence of a force field. Now it is taken back from B to A and it is observed that the work done in taking from A to B is not equal to the work done in taking from B to A. If

W_{n c}

W_{c}

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