d.) When is the particle moving in the positive direction? When 0 -7

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
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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someone please help I am stuck on the last two

I have no idea how to find when the particle is moving in the positive direction

Entered
Answer Preview
Result
3*(t^2)-14*t+2
3t2 – 14t + 2
correct
-13
-13
correct
0.1476
0.1476
correct
4.519
4.519
correct
2
incorrect
-7
-7
incorrect
At least one of the answers above is NOT correct.
(1 point) A particle moves according to the law of motion s(t) = t3 – 7t? + 2t, t > 0, where t is
measured in seconds and s in feet.
a.) Find the velocity at time t.
Answer: 3t^(2)-14t+2
b.) What is the velocity after 3 seconds?
Answer: -13
c.) When is the particle at rest? Enter your answer as a comma separated list. Enter None if the
particle is never at rest.
At ti = 0.1476
and t2 = 4.519
with ti < t2.
d.) When is the particle moving in the positive direction?
When 0 <t < 2
and t> -7
2.
Transcribed Image Text:Entered Answer Preview Result 3*(t^2)-14*t+2 3t2 – 14t + 2 correct -13 -13 correct 0.1476 0.1476 correct 4.519 4.519 correct 2 incorrect -7 -7 incorrect At least one of the answers above is NOT correct. (1 point) A particle moves according to the law of motion s(t) = t3 – 7t? + 2t, t > 0, where t is measured in seconds and s in feet. a.) Find the velocity at time t. Answer: 3t^(2)-14t+2 b.) What is the velocity after 3 seconds? Answer: -13 c.) When is the particle at rest? Enter your answer as a comma separated list. Enter None if the particle is never at rest. At ti = 0.1476 and t2 = 4.519 with ti < t2. d.) When is the particle moving in the positive direction? When 0 <t < 2 and t> -7 2.
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