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In an elastic collision of two particles, the following is conserved:

1. Momentum of each particle
2. Speed of each particle
3. Kinetic energy of each particle
4. Total kinetic energy of both the particles

Correct answer: Total kinetic energy of both the particles

Solution

In an elastic collision, the total kinetic energy of the two-particle system is conserved. Individual particle momentum, speed, and kinetic energy can change during the collision. Therefore, the correct option is the total kinetic energy of both particles.

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