The car `A` of mass `1500kg`, travelling at `25m//s` collides with another car `B` of mass `1000kg` travelling at `15m//s` in the same direction. After collision, the velocity of car `A` becomes `20m//s`. Calcualte the velocity of car `B` afrer collison.

Explanation

To solve the problem of finding the velocity of car B after the collision, we will use the principle of conservation of momentum.

### Step-by-Step Solution:

1. **Identify the masses and velocities:**
- Mass of car A, \( m_A = 1500 \, \text{kg} \)
- Initial velocity of car A, \( u_A = 25 \, \text{m/s} \)
- Mass of car B, \( m_B = 1000 \, \text{kg} \)
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