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If say you are travelling in a car around a roundabout you must contine to put more power into the engine to remain at a constant speed e.g. 20 mph.

When you reach the maximum amount of power that your car has then you will not be able to retain this constant speed and begin decelarating.

I cant see how this is logical since you would continue to decelarate untill you reached very low speeds say 1 mph yet will still be applying the full force the car has to offer to continue in a circular motion and may even reach 0 mph which i know is impossible.

Thanks

Paul