A moving particle of mass m makes a head-on perfectly inelastic collision with a particle of mas 2m which is initially at rest. Find the fractional loss in energy of the colliding partic le after collision.

Explanation

To solve the problem of finding the fractional loss in energy after a perfectly inelastic collision between two particles, we can follow these steps:

### Step 1: Understand the scenario
We have two particles:
- Particle 1: mass = \( m \), initial velocity = \( u_1 \)
- Particle 2: mass = \( 2m \), initial velocity = \( 0 \) (at rest)

After the collision, they stick together and move as a single particle.
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