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Need find end velocity given accel., time, distance

  1. Aug 27, 2012 #1
    urgent!! Need find end velocity given accel., time, distance

    1.The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows with a constant acceleration -5.90 m/s2 for 4.45 s, making straight skid marks 60.0 m long ending at the tree. With what speed does the car then strike the tree?


    3. The attempt at a solution

    so I tried to find Vo using Vo=x-at^2/2
    and I plugged Vo into Vf=Vi+at and got 13.4 but it was wrong.
    Please help me I am so confused.
     
  2. jcsd
  3. Aug 27, 2012 #2
    Re: urgent!! Need find end velocity given accel., time, distance



    The equation in red is wrong. See again the equation of motion (for position vs time).
    The idea of using the two equations to eliminate vo is OK.
     
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