Concept explainers
a.
To graph:The path of th football.
a.

Explanation of Solution
Given:
The equation of the path of football is
Formula/ concept used:
The graph is drawn using graphing calculator.
Graph:
The graph for function (trajectory) is shown in Figure-1 here.
Interpretation of Graph:
The graph of path of football is a parabola with vertex
b.
The height of the football when it is punted.
b.

Answer to Problem 61E
The height of football when it is punted is
Explanation of Solution
Given:
The equation of path of football is
Concept used:
The initial height when football is punted is obtained when
Calculations:
The equation of path of football is
Therefore, the initial vertical position or the height of football when it is punted is
Conclusion:
The height of football when it is punted is
c.
The maximum height of the football.
c.

Answer to Problem 61E
The maximum height of the football is
Explanation of Solution
Given:
The equation of path of football in part (a)
Conceptused:
When the parabola opens downward its
Calculations:
From the graph in part (a), the vertex of the parabola represented by the equation of the path of football
Thus,
The maximum height of the football is
Conclusion:
The maximum height of the football is
d.
The horizontal distance the football strike the ground
d.

Answer to Problem 61E
The football strikes the ground at horizontal distance
Explanation of Solution
Given:
The equation of path of football in part (a).
Formula used:
The football strikes the ground when its vertical height is zero.
Calculations:
The equation of path of footballis
The football will on the ground when
From the graph in part (a) we see that
Thus,the football strikes the ground at horizontal distance
Conclusion:
The football strikes the ground at horizontal distance
e.
To compare: The results from parts (b), (c), and (d).
e.

Answer to Problem 61E
The results obtained parts (b), (c), and (d) are identical.
Explanation of Solution
Given:
The results obtained in parts (b), (c), and (d).
Explanations:
In parts (b), (c), and (d) we find that the area
Thus, the results obtained parts (b), (c), and (d) are identical.
Chapter 2 Solutions
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