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Homework Help: Verification needed

  1. Oct 23, 2006 #1
    Hey everyone,

    Im studying for a test and wanted to verify my problems. I thought I would dabble on the dark side of the textbook and try the even ones too.

    Can you verify my answer?

    Kelly :)

    A 810kg car accelerates from rest to 27m/s in a distance of 120m. That is the magitudeof the aver net force acting on the car?

    Here is what I did.

    1) step up my list of info:
    Vi = 0
    Vf = 27 m/s
    a =
    t =
    x = 120 m

    2) Figured I needed the F=MA equation

    I have the mass so solve for acceleration.

    3) a = Vf^2 - Vi^2 / 2x.... which is: 27^2 / 2*120 = 3.075 m/s^2

    I plugged A into the equation

    4) F = (810 kg)(3.0375 m.s^2)
    F = 2460.375

    ??? did I get it?
  2. jcsd
  3. Oct 23, 2006 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Looks good to me :smile:
  4. Oct 23, 2006 #3
    Great thanks.. got a few more i will post.. I would apperciate a second opinion and a nudge or two... :)
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