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    iamemily's Avatar
    iamemily Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 1, 2007, 05:52 PM
    Average Acceleration/ Top Speed
    okay so I don't know how to do this question at all.

    it says : John begins to walk faster and accelerates at a rate of 5km/h. How long did it take him to reach a top speed of 12km/h?

    A=5
    V2=12
    t=?
    V2=?

    But if I use the acceleration equation I have Aav=delta V/delta T
    5= v1-12/t


    And I don't have enough information to finish it.. but maybe I'm not seeing it.. help please?
    s_cianci's Avatar
    s_cianci Posts: 5,472, Reputation: 760
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    #2

    Dec 1, 2007, 06:04 PM
    His initial velocity was probably 0. That should enable you to finish the question.
    cool_dude's Avatar
    cool_dude Posts: 124, Reputation: 9
    Junior Member
    		  
    #3

    Dec 2, 2007, 08:40 AM
    use the equation a = v/t where a = acceleration, v = velocity and t = time.
    so just plug in your numbers
    5 = 12/t

    and now just solve for t
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