A block of mass 1.2 kg moving at a speed of 20 cm /s collides head on with a similar block kept at rest. The coefficient of restitution is 3/5. Find the loss of kinetic energy during the collision.

Explanation

To solve the problem step by step, we will follow these procedures:

### Step 1: Identify the given values
- Mass of each block, \( m = 1.2 \, \text{kg} \)
- Initial velocity of block 1, \( u_1 = 20 \, \text{cm/s} = 0.2 \, \text{m/s} \)
- Initial velocity of block 2, \( u_2 = 0 \, \text{cm/s} = 0 \, \text{m/s} \)
- Coefficient of restitution, \( e = \frac{3}{5} = 0.6 \)

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