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    JasmineM23's Avatar
    JasmineM23 Posts: 1, Reputation: 1
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    #1

    Oct 11, 2011, 03:59 PM
    Kinematics
    t=30.0s
    Vi=30.0 km/h
    Vavg=45.0 km/h
    Vf=42.0 km/h
    x=? Which equation would I use to find x?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 12, 2011, 02:14 AM
    Use those maybe?



    then



    or this works too:



    then
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Oct 12, 2011, 06:25 AM
    It's interesting that V avg (average velocity I assume) is greater than either the initial or final velocity. Which tells me that either the acceleration of the object is not constant (which would be highly unusual for a typical high school physics problem) or there is an error in the original post?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Oct 12, 2011, 06:31 AM
    I didn't really put attention to that... but you're right, if the average velocity is true, then the problem cannot be solved without any more information.
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