A ball is thrown upward, and its height in meters after $$t$...

Question Analysis
This problem assesses the student's ability to solve a real-world application of a quadratic equation using the square root method.

Key Concept Explanation
The square root method is used to solve equations of the form , where is a constant. The solutions are given by .

Step-by-step Solution
1. Set the height equation equal to 5:
2. Subtract 20 from both sides: