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The coefficient of restitution (e) is defined as the ratio of the relative velocity of separation to the relative velocity of approach, and it equals 1 for an ideal elastic collision.

1. e = |v1 - v2| / |u1 - u2|
2. e equals 1 for an ideal elastic collision.
3. The collision is completely elastic.
4. e = |u1 - u2| / |v1 - v2|

Correct answer: e = |v1 - v2| / |u1 - u2|

Solution

The coefficient of restitution (e) is defined as the ratio of the relative velocity of separation to the relative velocity of approach, which is given by e = |v1 - v2| / |u1 - u2|.

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