A) \[{{W}_{C}}+{{W}_{NC}}=\Delta U\]
B) \[{{W}_{C}}+{{W}_{NC}}=\Delta KE\]
C) \[{{W}_{NC}}=\]loss of mechanical energy
D) Both [b] and [c] are correct
Correct Answer: D
Solution :
Idea To solve this question one must know the difference between conservative and non-conservative forces. One must also know work-energy theorem. If conservative and non-conservative forces are acting in the system \[\Rightarrow \]\[{{W}_{net}}={{W}_{C}}+{{W}_{NC}}=\Delta KE\] \[\Rightarrow \] \[{{W}_{\text{non}-\text{conservative}}}=\] loss in mechanical energy TEST Edge When only conservative forces are acting in the system, the total mechanical energy will remain conserved. If conservative as well as non-conservative forces are acting in the system then there will be the loss of mechanical energy due to non-conservative forces.
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