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anonymous
 4 years ago
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?
anonymous
 4 years ago
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?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0The 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.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Does this make sense?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I 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 .

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

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yup. 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.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So that's it. I can do it now. Thanks
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