Physics problem involing a lotus car

[ra180]

Homework Statement

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

Homework Equations

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

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

 

[CWatters]

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

Work = force * distance