You cannot do the calculation without additional information. At that speed, aerodynamic drag is the dominant force upon the car. Other retarding forces are engine cylinder friction, transmission friction, axle friction and rolling (tire) friction.
V = 100 km/h = 27.8 m/s
Drag = (1/2) (air density)*Cd*A*V^2
A is the frontal cross sectional area of the car.
Cd is the drag coefficient. For a well designed streamlined car, it is about 0.3.
The air density is typically 1.3 kg/m^3
For more data on the drag coefficient of cars, see
http://en.wikipedia.org/wiki/Automobile_drag_coefficient
Do the numbers.
What is the net force on a Mercedes convertible traveling along a straight road at a steady speed of 100km/h?
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