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Homework Help: Vector Velocity Problem

  1. Jan 18, 2012 #1
    1. The problem statement, all variables and given/known data

    The velocity v of a particle moving in the xy plane is given by v = (6.0t - 4.0t2) i + 6.0 j, with v in meters per second and t (> 0) is in seconds.

    (d) When does the speed equal 10 m/s?

    2. Relevant equations

    ?

    3. The attempt at a solution

    6-8t=-10
    t=2s
    That's not right
     
  2. jcsd
  3. Jan 18, 2012 #2
    Well, how is the speed defined in terms of the vector velocity
     
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