Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
Hananana
Group Title
A particle moves on a horizontal line as described by the equation s = t 3 −12t + 3 . a. When is the particle changing directions? b. When is the particle moving to the right and when is it moving to the left?
 2 years ago
 2 years ago
Hananana Group Title
A particle moves on a horizontal line as described by the equation s = t 3 −12t + 3 . a. When is the particle changing directions? b. When is the particle moving to the right and when is it moving to the left?
 2 years ago
 2 years ago

This Question is Open

Denebel Group TitleBest ResponseYou've already chosen the best response.0
The particle changes direction when the velocity changes sign, so you would have to find out what specific times t, the function's velocity goes from neg>pos or pos>neg.
 2 years ago

Denebel Group TitleBest ResponseYou've already chosen the best response.0
You can set the v=0
 2 years ago

Denebel Group TitleBest ResponseYou've already chosen the best response.0
Does this make sense?
 2 years ago

Hananana Group TitleBest ResponseYou've already chosen the best response.0
I already did it. But I was thinking about what to do with 2. I came up with 3(t2)(t+2)=0 t=2, what shall I do with 2? There's no negative time .
 2 years ago

Denebel Group TitleBest ResponseYou've already chosen the best response.0
Yup, if you can't have 2 but 2 is also an answer, the answer will be.....?
 2 years ago

Denebel Group TitleBest ResponseYou've already chosen the best response.0
Yup. I haven't done the problem, but if that was your point of confusion, yes, if you have something for t that doesn't make sense (such as when t=0, or neg.) you can disregard it and only use the positive answer.
 2 years ago

Hananana Group TitleBest ResponseYou've already chosen the best response.0
So that's it. I can do it now. Thanks
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.