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Homework Help: A point with velocity, V

  1. Mar 29, 2009 #1
    1. The problem statement, all variables and given/known data

    A point: [tex][x_{0}, y_{0}, z_{0}, t_{0}][/tex]
    It's velocity: [tex]V_{a} = [v_{1}, v_{2}, v_{3}, v_{4}][/tex]

    What is wrong with this equation:

    [tex]x^{b} = [x_{0} + v_{1} * t, y_{0} + v_{2} * t, z_{0} + v_{3} * t, t_{0} + t][/tex]
  2. jcsd
  3. Mar 30, 2009 #2


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    Science Advisor
    Homework Helper

    Nothing is wrong with that, as long as V is a constant vector.
    For example, if Va = (2, 3, 4, 1) then your formula for x satisfies v = dx/dt.
    However, if Va = (3t, t2, 3t - 12, t2/6) it doesn't.
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