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    (Original post by Marxist)
    You should have two of the same displacements for the time T, you set them equal to each other to get V in terms of T, which is and then sub in to the two equations. Adding them together you get the quadratic



    therefore

    once we've solved the equation(the other value of T is discarded, of course).
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    (Original post by Sayless)
    I'm stuck on the following question 19a)

    I have to find how long the car is accelerating for however I have two unknowns whenever I try make a suvat equation, I only know
    a = 1.5
    u = 0
    I don't know anything else for that time interval
    The distance i'm giving is overall, not that for time period, and the time is overall also which doesn't help, how can I answer this question?
    First apply first equation of motion v=u+at then let u=0
    then t=T
    u will get aT=1.5 ......(i)
    from second equation s=ut+1/2at^2
    s=312,t=30s
    312=30a/2
    a=21m/s^2
    then (i)....aT=1.5
    21T=1.5
    therefore T=0.07s
 
 
 
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Updated: November 12, 2015
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