No motion of the vehicle means zero power can be generated at the wheel.
Let's stick with that for a moment.
So you say that for any non-zero speed, the power is (whatever your formula is) or about 60N * (wind speed - vehicle speed), but right at zero the power goes to zero?
So if I'm sitting there and the vehicle is stopped with brakes, there's no energy being dissipated by the brake, but if I allow the vehicle to creep forward at 1mm/s, now the brakes are dissipating almost 600W?
Yes in theory if you want to keep the vehicle at 1mm/s brakes will need to dissipate 600W
In real world there is elasticity and plasticity if needed as everything is made up of atoms.
There is also a stick slip hysteresis that will prevent you to move to slow it will be a fairly sudden transition from moving to stopped.
A wind turbine is only about 40% efficient and one fixed to ground and about 1m^2 swept area will produce around 240W in 10m/s wind.
Sails are just so much more efficient but you do not usually want your wind turbine to move.
For accelerating a vehicle you can not beat a sail so even if you want to use energy storage you will still select a sail and not a propeller.
The propeller/fan just has that effect that it can store energy in the compressible medium and use that to accelerate latter.
Nice thing about that is that stored energy being in material will not take any space/weight on the vehicle.
Similar thing will be a vehicle with wheels only having one wheel on a solid road and one wheel on a very long moving conveyor belt but that conveyor surface will be some super stretchy rubbery material so if you are stopped a lot of potential energy is stored in the long rubbery surface of the conveyor belt then if that wheel was just with brake on and not connected to other wheel it will be like a sail vehicle impossible to exceed conveyor speed.
But if the wheel on the solid road is connected with some gear ratio to the wheel on the flexible conveyor belt taking some of the power from accelerating the vehicle and putting it back in stretching that rubbery material even more than vehicle can exceed conveyor speed for some limited amount of time.