The fight of a baseball that has been hit when it was 4 feet off the ground is modelled by the function
where
To find : How long will it take before the ball lands on the ground.
Answer to Problem 7STP
The ball takes 4.74 seconds before it lands on the ground.
Explanation of Solution
Given information :
The flight of the baseball that has been hit when it was 4 feet off the ground is modeled by the function
Calculation :
When the ball land on the ground then the height becomes zero that is
Therefore, set the equation to zero and solve for t:
This is a quadratic equation.
For the quadratic equation
Now, for the given equation
Therefore,
Since, time can never be negative, therefore
Hence,
The ball takes 4.74 seconds before it lands on the ground.
Chapter 9 Solutions
High School Math 2012 Common-core Algebra 1 Practice And Problem Solvingworkbook Grade 8/9
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