Joe drives north from Eugene, leaving at noon. If t is the number of hours since noon and d(t) is his position measuring north from Eugene, his velocity is given by d'(t) = t3 – 11t2+ 24t mi for 0

Calculus: Early Transcendentals
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ISBN:9781285741550
Author:James Stewart
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Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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19. Joe drives north from Eugene, leaving at noon. If t is the number of hours since
noon and d(t) is his position measuring north from Eugene, his velocity is given
by
d'(t) = t³ – 11t2 + 24t
mi
-
for 0 <t< 10.
(a) For how long is he driving southbound?
(b) At time t = 1, is Joe pressing down on the car's accelerator pedal or easing
up on it?
(c) What is the greatest speed Joe reaches over the course of his journey (from
t = 0 to t = 10), and is this speed northbound or southbound?
(d) From the perspective of an observer on the ground, is Joe speeding up or
slowing down at time t = 2?
Transcribed Image Text:19. Joe drives north from Eugene, leaving at noon. If t is the number of hours since noon and d(t) is his position measuring north from Eugene, his velocity is given by d'(t) = t³ – 11t2 + 24t mi - for 0 <t< 10. (a) For how long is he driving southbound? (b) At time t = 1, is Joe pressing down on the car's accelerator pedal or easing up on it? (c) What is the greatest speed Joe reaches over the course of his journey (from t = 0 to t = 10), and is this speed northbound or southbound? (d) From the perspective of an observer on the ground, is Joe speeding up or slowing down at time t = 2?
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