Concept explainers
a.
To find: height of the ball when it is punted.
a.

Answer to Problem 68E
Explanation of Solution
Given:
The path of a punted football is modeled by
Calculation:
The height of the ball when it is punted is the height when
Substitute
Conclusion
The height of the ball when it is punted is 1.5 feet.
b.
To find: maximum height of the punt.
b.

Answer to Problem 68E
Explanation of Solution
Given:
The path of a punted football is modeled by
Concept Used:
For the function
When
When
Calculation:
Now compare the given function
Clearly
So by the above definition, f has a maximum at
So, the punt reaches the maximum height when the horizontal distance (in feet) from the point at which the ball is punted is,
And the maximum height of the punt is:
Conclusion:
Maximum height of the punt is approximately 104.02 feet.
c.
To find: length of the punt.
c.

Answer to Problem 68E
Explanation of Solution
Given:
The path of a punted football is modeled by
Concept Used:
The roots of the equation
Calculation:
Length of the punt is the distance travelled by ball before it stops, that is when its height is again 0 feet.
Substitute
Apply quadratic formula,
Since distance can’t be negative. So, only positive root is considered.
Thus,
Conclusion:
Length of the punt is approximately 228.64 feet.
Chapter 2 Solutions
EBK PRECALCULUS W/LIMITS
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