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    My answer is different to that of mark scheme. I am probably being thick but I just can't spot my error. Couldn't upload photos so heres a link to them
    https://plus.google.com/110645167952...ts/GobAfUyf9iG
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    (Original post by Nels98)
    My answer is different to that of mark scheme. I am probably being thick but I just can't spot my error. Couldn't upload photos so heres a link to them
    https://plus.google.com/110645167952...ts/GobAfUyf9iG
    Your integration is wrong: \mathbf{v} =\int 0i - 2j \, \mathrm{d}t = ci - (2t + d)j.

    Then, 4i + 0j = ci - dj \Rightarrow c =4, d=0.
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    (Original post by Zacken)
    Your integration is wrong: \mathbf{v} =\int 0i - 2j \, \mathrm{d}t = ci - (2t + d)j.

    Then, 4i + 0j = ci - dj \Rightarrow c =4, d=0.
    thats no different isn't it? surely that still ends up with v=4i-2tj
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    (i think) The only issue is that they have a t in the position vector for the j term whereas i have a t^2.
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    (Original post by Nels98)
    thats no different isn't it? surely that still ends up with v=4i-2tj
    Ah, yes - fair enough. I misread. I agree with your final answer.
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    (Original post by Zacken)
    Ah, yes - fair enough. I misread. I agree with your final answer.
    hmm seems strange for an OCR MEI mark scheme to be wrong but thanks for confirming my answer
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    (Original post by Nels98)
    hmm seems strange for an OCR MEI mark scheme to be wrong but thanks for confirming my answer
    It's probably more a typographical error on their part, oh well.
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    Agree with OP and Zacken. t^2
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    ok good stuff, thanks!
 
 
 
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