A block of mass m moving at speed `upsilon` collides with another block of mass 2 m at rest. The lighter block comes to rest after the collision. Find the coefficient of restitution.

Explanation

To solve the problem step by step, we will analyze the collision between the two blocks and apply the principles of conservation of momentum and the definition of the coefficient of restitution.

### Step 1: Identify the given data
- Mass of the first block (m) = m
- Initial speed of the first block (u₁) = v
- Mass of the second block (2m) = 2m
- Initial speed of the second block (u₂) = 0 (at rest)
- Final speed of the first block after collision (v₁) = 0 (comes to rest)
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