Algebra-1

Question Analysis
This question tests the application of the quadratic formula in a real-world context. The height equation models the motion of a ball thrown upward. The goal is to find the time when the ball hits the ground, which corresponds to the roots of the quadratic equation.

Key Concept Explanation
The quadratic formula, , is used to solve for the variable in the quadratic equation. In this context, the roots represent the times when the ball is at ground level (height = 0).

Step-by-step Solution
1. Set the height equation to zero: .
2. Identify coefficients:

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