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During an elastic collision, under what condition do the two objects exchange their velocities?

1. The velocities of the objects always swap in elastic collisions.
2. The objects must have identical masses for their velocities to exchange.
3. The velocities of the objects remain constant regardless of the collision.
4. The masses of the objects are irrelevant to velocity exchange.

Correct answer: The objects must have identical masses for their velocities to exchange.

Solution

In an elastic collision between two objects of equal masses, their velocities are exchanged due to the conservation of momentum and kinetic energy.

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