A) \[{{W}_{ext}}=\Delta U\](always)
B) \[{{W}_{\text{conservative}}}=-\Delta U\](always)
C) \[{{W}_{ext}}=\Delta U+\Delta KE\] (always)
D) \[{{W}_{\operatorname{co}nservative}}=-\Delta KE\]
Correct Answer: B
Solution :
[b] If only conservative forces are acting in the system. |
\[\Rightarrow \] \[{{W}_{ext}}=\Delta U\] (If body moves without acceleration) |
\[{{W}_{ext}}=\Delta U+\Delta KE\] |
(if body moves with acceleration) |
\[\Rightarrow \] \[{{W}_{\text{conservative}}}=-\Delta U\] (always) |
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