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The final kinetic energy equals the initial kinetic energy only in a collision that is:

ASticky
BElastic
CInelastic
DSticking
Answer & Solution
Correct answer: B. Elastic
1. Energy lost to deformation lowers the final kinetic energy. 2. Only one type loses none. 3. That is the elastic collision. _Source: syllabus Physics Part I, Chapter 6, Work, Energy and Power._
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