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Thread: Simple motion equation

  1. #1 Simple motion equation 
    Junior Member
    Join Date
    Jan 2014
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    1
    Hi,

    I'm revising for a test tomorrow. Just trying to find the displacement of a car.

    I'm getting 2 different answers with different equations. Where am I going wrong?

    car.jpg
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  2. #2  
    Senior Member
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    Jan 2014
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    out there
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    Your final velocity v is not your average velocity. The average velocity under contant a is (v initial + v final )/2
    You can now multiply the average velocity to obtain total distance 10 x 8 = 80
    20 x 8 is incorrect.
    The distance travelled is time x average velocity.



    Also the distance travelled x = 1/2 at^2 +v initial t = 1/2 at^2 = 0.5 * 2.5 * 8 * 8 =80
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