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Physics problem involing a lotus car need help

  1. Aug 3, 2014 #1
    1. The problem statement, all variables and given/known data

    When the a lotus is driven at average speed of 20 m/s the drag force on the vehicle is 400N. If the average fuel conversion is 13% then calculate the distance traveled by the vehicle.

    Mass of Vehicle = 903kg
    Volume of fuel tank= 43.5 litre
    Density of fuel= 775 kg/m^3
    Calorific Value of fuel= 42.7 MJ/kg



    2. Relevant equations

    F=ma and V^2= U^2 + 2as



    3. The attempt at a solution


    (1)400=903a
    a= 0.443m/s^2

    (2) V^2= U^2 +2as
    20^2+2(0.443)s
    S= 451.47m
     
  2. jcsd
  3. Aug 4, 2014 #2

    CWatters

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    Science Advisor
    Homework Helper

    I think you can forget equations of motion. This appears to be about work and energy. Try an equation like...

    Work = force * distance
     
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