Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.6 Parametric Equations, Graphs, and Applications - 8.6 Exercises - Page 399: 45c

Answer

The maximum height of the baseball is 51.0 feet. The ball has traveled a horizontal distance of 55.36 feet.

Work Step by Step

$y = 55.4~t-16~t^2+3$ $y = -16~t^2+55.4~t+3$ When $y = at^2+bt+c$, the vertex of the parabola is at the point $t=-\frac{b}{2a}$ We can find $t$ of the vertex: $t=-\frac{b}{2a}$ $t=-\frac{55.4}{(2)(-16)}$ $t = 1.73$ We can find the height when $t = 1.73$: $y = 55.4~t-16~t^2+3$ $y = (55.4)(1.73)-(16)(1.73)^2+3$ $y = 51.0~feet$ The maximum height of the baseball is 51.0 feet. We can find the horizontal distance at $t = 1.73$: $x = 32~t$ $x = (32)(1.73)$ $x = 55.36~feet$ The ball has traveled a horizontal distance of 55.36 feet.
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