Consider a collision between two particles one of which is at rest and the other strikes it head on with momentum `P_(1)`. Calculate the energy of reaction `Q` in terms of the kinetic energy of the particles before and they collide.

Explanation

To solve the problem of calculating the energy of reaction \( Q \) in terms of the kinetic energy of the particles before they collide, we can follow these steps:

### Step 1: Understand the System
We have two particles:
- Particle 1 with mass \( m_1 \) and initial momentum \( P_1 \) (moving).
- Particle 2 with mass \( m_2 \) at rest, so its momentum \( P_2 = 0 \).

### Step 2: Apply Conservation of Momentum
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