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Math Help - Please solve - simultaneous equation

  1. #1
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    Question Please solve - simultaneous equation

    This one has had me stumped for a few days now. Hope someone can help shed some light on this question.

    1) For a body travelling with constant acceleration of a meters/second^2 its velocity Vm/sec after t seconds is given by V=u+at where u is its initial velocity.

    After six seconds the body had a velocity of 30 metres per second. 10 seconds later its velocity V was 70m/sec.

    Form a pair of simultaneous equations and solve them to find:
    a) the acceleration
    b) the intial velocity
    c) the velocity after 20 seconds
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  2. #2
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    Quote Originally Posted by GAVREED2 View Post
    its velocity Vm/sec after t seconds is given by V=u+at where u is its initial velocity.

    Into this equation substitute in the points (t,V)=(6,30) and (t,V)=(16,70) to find u and a

    Do you follow?
    Last edited by pickslides; May 25th 2010 at 07:34 PM. Reason: Wrong value
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  3. #3
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    So: 30=u+6a
    70=30+10a

    Does part c) after 20 seconds substitute to
    30=u+6a
    70=30+20a


    Quote Originally Posted by pickslides View Post
    Into this equation substitute in the points (t,V)=(6,30) and (t,V)=(10,70) to find u and a

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  4. #4
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    I have made an edit above

    You need to solve

    70=u+16a ...(1)
    30=u+6a ...(2)

    Now (1)-(2)=?
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