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Q.
A body moves from point $A$ to $B$ under the action of a force, varying in magnitude. What is the work done?
Work, Energy and Power
Solution:
$W = W _{12}+ W _{23}+ W _{34}+ W _{45} $ (W = area under graph )
$=10 \times 1+\left[10 \times 1+\frac{5 \times 1}{2}\right]+\frac{15 \times 1}{2}-\frac{15 \times 1}{2}$
$=10+10+2.5+7.5-7.5=22.5\, J$
