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Homework Help: Magnitude of the net force

  1. Jan 5, 2015 #1
    1. The problem statement, all variables and given/known data

    An 850 kg car accelerates uniformly from rest to 33 m/s in a distance of 120 m. What is
    the magnitude of the net force acting on the car?

    2. Relevant equations

    F = ma

    dynamic equations

    3. The attempt at a solution

    So i think i have this one sorted but just posting to see iv got it right .

    Seeing as i need acceleration to find the force i have to find it using the info i have so

    a= ?
    s= 120
    v = 33
    u = 0
    t = not needed .


    (33)^2 = 0 + 2(a)120

    1089 = 240a

    4.5375 = a

    4.5375 m/s^2

    F = ma

    850 x 4.5375

    3856.875 N

  2. jcsd
  3. Jan 5, 2015 #2


    User Avatar

    Staff: Mentor

    Method looks right. (I haven't checked your arithmetic.)
  4. Jan 5, 2015 #3
    It seems right ,,.
  5. Jan 5, 2015 #4
    Great! thanks lads!! this site rocks!! need to find a similar one for chemistry and biology haha
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