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Homework Help: Find the tracrive force

  1. Jan 31, 2008 #1
    1. The problem statement, all variables and given/known data
    A car pf mass 900kg accelerates from rest to a speed of 20 ms^-1 whilst moving 80m along a horizontal road. Find the tractive force (i.e. the driving force) exerted by the engine, assuming that it is constant and that there is a constant resistance to motion of 250N.
    2. Relevant equations

    3. The attempt at a solution
    m = 900kg, u=0ms^-1 , v=20ms^-1, s = 80m
    acceleration = (20-0)/2 = 10ms^-2
    force = ma = 900*10 = 9000N
    workdone = 7.2*10^5J

    What about the constant resistance to motion of 250?
     
  2. jcsd
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