For perfectly inelastic collision cofficient of restitution e is

Explanation

To solve the question regarding the coefficient of restitution \( e \) for a perfectly inelastic collision, we can follow these steps:

### Step 1: Understand the concept of the coefficient of restitution
The coefficient of restitution \( e \) is defined as the ratio of the relative velocity of separation to the relative velocity of approach of two colliding bodies. Mathematically, it can be expressed as:
\[ e = \frac{\text{Relative velocity after collision}}{\text{Relative velocity before collision}} \]

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