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Math Help - Inverse/Direct Proportionality help please!

  1. #1
    Newbie
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    Oct 2009
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    Inverse/Direct Proportionality help please!

    Hello all

    Geez i dunno if this is even direct or inverse proportionality, or if this threads even in the right section :S sorry, first time here!

    But anyway, to the question..

    "A particle moves along a line.
    For 't' bigger than or equal to 1, the distance of the particle from 'O' at time 't' seconds is 'x' metres, where:
    x=20/t
    Find an expression for the acceleration of the particle"

    Question taken from an IGCSE paper im stuck on.. dont really understand how to solve it at all

    Thanks in advance!
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  2. #2
    MHF Contributor
    Joined
    Mar 2007
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    1,240

    Talking

    I'm afraid I'm not seeing how proportionality comes into play here...?

    You're given the position function (the distance from point O) as a function of time, and are asked for the acceleration function. So differentiate twice.
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