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A completely inelastic collision is one in which the two colliding particles:

1. are separated after the collision
2. remain together after the collision
3. split into small fragments flying in all directions
4. none of the above

Correct answer: remain together after the collision

Solution

In a completely inelastic collision, the colliding bodies stick together and move as a single body after impact. Momentum is conserved, but kinetic energy is not maximally retained. This is the defining feature of such collisions.

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