alleryThe work–energy theorem states that the net work done on a body equals:
AThe change in its momentum
BThe change in its kinetic energy
CThe change in its potential energy
DThe change in its total mechanical energy
Answer & Solution
Correct answer: B. The change in its kinetic energy
1. W_net = ΔKE = ½ m v² − ½ m u².
2. The proof follows from integrating F = m dv/dt along the path.
3. Change in PE relates to work by conservative forces only, not total work.
_Source: syllabus Physics Ch 5, §5.3 Work–Energy Theorem, p. 78_
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