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    I'm currently doing the M2 WJEC June 2010 paper and I would really appreciate it if someone could link me to where I could view the mark scheme. I've tried Google to no avail, I can only find the Pure and Further Pure mark schemes.

    Alternatively, I'm currently stuck on question 2b. "Calculate the value of t when the velocity of P is perpendicular to the vector 2i - j." The position vector r of particle P is (3t^2 + 1)i + (13t - 2t^2)j. If anyone could help me with this question it would be greatly appreciated. I missed two weeks of school when we were studying this topic and I still don't fully understand what to do, or even where to begin.

    (Also, if anyone could direct me to the general thread where requests for past papers are, instead of me posting a new thread, I'd be very thankful.)
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    (Original post by Marucs)
    Alternatively, I'm currently stuck on question 2b. "Calculate the value of t when the velocity of P is perpendicular to the vector 2i - j." The position vector r of particle P is (3t^2 + 1)i + (13t - 2t^2)j. If anyone could help me with this question it would be greatly appreciated. I missed two weeks of school when we were studying this topic and I still don't fully understand what to do, or even where to begin.
    To find the velocity vector, differentiate the position vector with respect to t.

    Two vectors are perpendicular when their dot product equals zero, so find the dot product of the velocity with 2i - j, set this equal to zero, and solve for t.
 
 
 
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