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Work done on a system, i.e., mechanical work can be shown as

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a
Pext. .A.l
b
Pext.-∆V
c
-PextVf-Vi
d
All of these

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detailed solution

Correct option is D

Work done on a system, i.e., mechanical work = force × distance(a) Pext.×A×l(b) Pext.×A×l or Pext(-∆V)(c) -PextVf-Vi

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