The work done is defined as \( W=\int \vec{F} \cdot d \vec{r} \). It can be measured as area und....

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The work done is defined as \( W=\int \vec{F} \cdot d \vec{r} \). It can be
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measured as area under the force-displacement graph. It is a scalar quantity. The figure shows the variation of force and displacement.
Positive work done is during displacement:
(1) 0 to \( 80 \mathrm{~m} \)
(2) 0 to \( 20 \mathrm{~m} \& 40 \) to \( 60 \mathrm{~m} \)
(3) 0 to \( 40 \mathrm{~m} \)
(4) 20 to \( 40 \mathrm{~m} \)


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