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Homework Help: Kinematics Vehicle Overtaking

  1. Sep 10, 2010 #1
    1. The problem statement, all variables and given/known data
    As a traffic light turns green, a waiting car starts with a constant acceleration of 6.0 m/s^2. At the instant the car begins to accelerate, a truck with a constant velocity of 21 m/s passes in the next lane.

    a) How far will the car travel before it overtakes the truck?
    b) How fast will the car be traveling when it overtakes the truck?

    2. Relevant equations
    deltad=Vi x deltat + 1/2a(deltat)^2
    deltad=Vf x deltat - 1/2a(deltat)^2
    Vf^2=Vi^2+2a deltad

    3. The attempt at a solution

    Vi = 0 m/s
    a = 6.0 m/s^2
    Delta d = ?

    Vi = 21 m/s
    Vf = 21 m/s
    a = 0 m/s^2

    I can only see these variables in the question, and I don't know what formula to use. Could someone point me in a direction please? I'm really stressing over this, i've tried multiple times.
    Last edited: Sep 10, 2010
  2. jcsd
  3. Sep 10, 2010 #2


    User Avatar
    Homework Helper
    Gold Member

    Hello CHARG3RS,

    Welcome to Physics Forums!
    Okay, you've tried multiple times. Show us your attempt and tell us where you are getting stuck, and maybe we can help.
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