alleryThe work-energy theorem states that the work done on an object by all forces equals:
AThe change in its mass
BThe change in its temperature
CZero, always
DThe change in its kinetic energy (KE = ½mv²)
Answer & Solution
Correct answer: D. The change in its kinetic energy (KE = ½mv²)
**Work-energy theorem:** W_net = ΔKE = (½mv²_final) − (½mv²_initial).
When you push a ball, your work increases its KE
when a goalkeeper stops it, her negative work decreases its KE to zero.
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