That doesn't make sense. What do you mean, what will happen? Happen to what..?
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This may have been the result of steering the car around a curve in the road while maintaining constant speed.
The term "steady speed" indicates a constant velocity. This implies that there is no net acceleration, and thus no net force. Any net force on a moving object will cause a change in velocity, as per Newton's First and Second Laws.
There is no acceleration if the car is travelling at a steady 54,000 miles per hour.
You have already stated its speed in the question !
Both the speed and velocity have increased as a result of acceleration.