Finding velocity of a car using simulink?

hi. i need to find the velocity and time required for the race car to complete one lap? I have to consider the drag,friction force, weight and thrust of a car. i have formed the mathematical model. but there is velocity (v) in the Drag force and the thrust. i used equation of motion to form the mathematical model which is : m*dv/dt= weight-drag force-friction force+ thrust where thrust is= power/velocity drag is =(C*P*V^2*A)/2 Friction= umg weight = mg I need to find the change in velocity with respect to time and also the time the car is going to take to complete one lap of a race track. i need to consider the change in velocity of the car at the corner as well. Thank you Sorry for my bad English