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Math Help - [SOLVED] Equations of Motion

  1. #1
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    [SOLVED] Equations of Motion

    This is just something which has been bothering me and want your expertise on it.

    Initial Velocity = 0
    Acceleration = 1
    Distance = 3

    Find the time taken to cover that distance.

    So generally I would use the second equation of motion to get an answer

    t=2.45s

    But why don't I get the same answer when I try to solve it in this way...

    a=\frac{v}{t} and v=\frac{d}{t}

    Thus,

    a=\frac{d}{t}/t

    a=\frac{d}{t^2}

    1=\frac{3}{t^2}

    t=1.73s

    What am I doing wrong? Why don't the answers match?
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  2. #2
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    Quote Originally Posted by unstopabl3 View Post
    This is just something which has been bothering me and want your expertise on it.

    Initial Velocity = 0
    Acceleration = 1
    Distance = 3

    Find the time taken to cover that distance.

    So generally I would use the second equation of motion to get an answer

    t=2.45s

    But why don't I get the same answer when I try to solve it in this way...

    a=\frac{v}{t} and v=\frac{d}{t} Mr F says: These equations give average values.

    Thus,

    a=\frac{d}{t}/t

    a=\frac{d}{t^2}

    1=\frac{3}{t^2}

    t=1.73s

    What am I doing wrong? Why don't the answers match?
    ..
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  3. #3
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    Oh yes! I completely overlooked that bit!

    Thanks
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