Which of these would NOT be an example of an inelastic collision?

Which of these would NOT be an example of an inelastic collision?
  1. A match scrapes a matchbook and bursts into flame
  2. Neutrons fuse with hydrogen atoms in a nuclear reactor core such that kinetic energy is conserved
  3. Two cars crash into each other, and stop with a loud bang
  4. Two hydrogen atoms fuse together to form a helium atom and gamma radiation
  5. A man is clapping his hands such that they move with equal, but opposite velocities

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