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Homework Help: Radius vector of a point

  1. Jun 18, 2008 #1
    1. The problem statement, all variables and given/known data

    The radius vector of a point depends on time t, as [tex]\vec{r}=\vec{c}t+\vec{b}\frac{t^{2}}{2}[/tex], where [tex]\vec{c}[/tex] and [tex]\vec{b}[/tex] are constant vectors. Find the modulus of velocity and acclereation at any time t.



    3. The attempt at a solution
    [tex]\vec{v}=\vec{c}+\vec{b}t[/tex]

    [tex]\vec{a}=\vec{b}[/tex]

    But how shall I find the modulus?
     
    Last edited: Jun 18, 2008
  2. jcsd
  3. Jun 18, 2008 #2

    Dick

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    Science Advisor
    Homework Helper

    The modulus of a vector v is the square root of v dot v.
     
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