A ball is thrown vertically upwards. It returns 6 s later. Calculate the greatest height reached by the ball

Explanation

To solve the problem of calculating the greatest height reached by a ball thrown vertically upwards that returns 6 seconds later, we can follow these steps:

### Step-by-Step Solution

1. **Understand the Total Time of Flight**:
The ball is thrown upwards and returns after a total time of 6 seconds. This means the time taken to reach the maximum height is half of the total time.
\[
t = \frac{6 \text{ s}}{2} = 3 \text{ s}
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