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Math Help - position vector at time t

  1. #1
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    position vector at time t

    The position vector of a particle at time t >= 0 is:
    r(t) = (cost + tsint)i + (sint - tcost)j
    (a) Show that the speed of ds/dt = t.
    (b) Show that ar = 1 and an = t.

    how do i do this??
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  2. #2
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    Quote Originally Posted by Arez View Post
    (a) Show that the speed of ds/dt = t.
    (b) Show that ar = 1 and an = t.

    how do i do this??
    The first step is to go back to your class notes or textbook and review the definitions of the things you've been asked to find.
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  3. #3
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    Quote Originally Posted by Arez View Post
    (a) Show that the speed of ds/dt = t.
    (b) Show that ar = 1 and an = t.

    how do i do this??
    I have no idea what you mean by "the speed of ds/dt" because there is no "s" in your original problem. Do you mean "Find the speed s= dr/dt"?
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