Two balls are thrown simultaneously, A vertically upwards with a speed of 20 m/s from the ground, and B vertically downwards from a height of 40 m with the same speed along the same line of motion. At what point do the two balls collide? Take `g = 9.8 m//s^(2)`.

Explanation

To solve the problem of the two balls colliding, we will use the equations of motion. Let's break down the solution step by step.

### Step-by-Step Solution:

1. **Understanding the Problem**:
- Ball A is thrown upwards from the ground with an initial velocity \( u_A = 20 \, \text{m/s} \).
- Ball B is thrown downwards from a height of \( h = 40 \, \text{m} \) with the same initial velocity \( u_B = 20 \, \text{m/s} \).
- We need to find the point where the two balls collide.
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