[ODE] How to handle accelration and speed of car dynamically using ODE

[Naveed Hanif]

I want to implement speed and accelartion using ode in car racing when car 
is taking a turn it should decarese speed when accleration key is released 
it should decrease speed dynamically like we use to in real life cars i 
think these things could be done by Runge Kutta mathod can anybody tell me 
any method or technique which can be used if somebody can send me a sample 
code it would be great

Best Regards

Naveed