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Vectors - velocity is changing but speed is not

  1. Feb 5, 2014 #1
    Vectors -- velocity is changing but speed is not...

    1. The problem statement, all variables and given/known data
    Which pair of vectors represent an object whose velocity is changing but whose speed is NOT changing?

    2. Relevant equations

    3. The attempt at a solution

    E? V is going left, indicating negative, while acceleration goes in the other direction.
  2. jcsd
  3. Feb 5, 2014 #2


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    Staff: Mentor

    But that acceleration is going to change the speed. It will, initially, decrease the speed. E is not correct.
  4. Feb 5, 2014 #3
    #C, D, E can't be correct then by that logic... I hope I'm interpreting that correctly.
  5. Feb 5, 2014 #4


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    Science Advisor
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    Right... and one more - which?
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