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A GCE OL pastpaper question.

  1. Jul 25, 2007 #1
    A GCE OL pastpaper question.......

    Can someone get over this for me please............thanx ie

    The velocity, v m/s, of a particle P after t seconds is given by
    v = 20 + 12*t[squared] - t[cubed] , t is larger than 0.

    Calculate the value of t when the acceleration of P is 0.
     
  2. jcsd
  3. Jul 25, 2007 #2
    [tex]v(t)=20+12t^2-t^3,\;\;t>0[/tex]

    [tex]We \;know:\,a(t)=v\prime(t)[/tex]

    [tex]a(t)=24t-3t^2=0[/tex]

    [tex]t=8\,(sec)[/tex]
     
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