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Math Help - calc question

  1. #1
    Junior Member
    Joined
    Dec 2008
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    37

    Angry calc question

    the motion of a particle is given by the parametric equations x=t^2+t and y=3t-2. the speed of the particle at t=2 is....?
    a.) 2 sq.roots of 2
    b.) sq. root of 26
    c.) sq. root of 34
    d.) 6
    e.) 2 sq. roots of 13

    i got the answer 3/5 and don't understand why i'm not even close to any of these answers.
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  2. #2
    Junior Member
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    Feb 2009
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    Scotland
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    You simply require the formula:

     v(t) = \sqrt{(x(t))^2 + (y(t))^2}

    by putting the value t=2 into both equations and using the formula above you should get the correct answer.
    I'll leave you to do the calculations.
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  3. #3
    Junior Member
    Joined
    Dec 2008
    Posts
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    thanks i got e.) 2 sq. roots of 13
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