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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?
 one year ago
 one year 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?
 one year ago
 one year ago

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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.
 one year ago

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

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

Hananana Group TitleBest ResponseYou've already chosen the best response.0
So that's it. I can do it now. Thanks
 one year ago
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