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    For question 7iv, why is the value of T the smaller value of the quadratic? So, why is t 3 instead of 6??

    http://pdf.ocr.org.uk/download/pp_11..._gce_4728.pdf?
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    (Original post by master y)
    For question 7iv, why is the value of T the smaller value of the quadratic? So, why is t 3 instead of 6??

    http://pdf.ocr.org.uk/download/pp_11..._gce_4728.pdf?
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    They only really collide once.

    From the quadratic equation, it tells us they collide either at time 3 or 6.

    If they collided when t=3, then they won't collide again.

    So the time cannot be 6. Since they have already collided.

    And the question says "P and Q collide first when t=T."

    Hope this makes sense.
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    (Original post by kogaht)
    They only really collide once.

    From the quadratic equation, it tells us they collide either at time 3 or 6.

    If they collided when t=3, then they won't collide again.

    So the time cannot be 6. Since they have already collided.

    And the question says "P and Q collide first when t=T."

    Hope this makes sense.
    oh gosh that does make sense! thanks!

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